I find your post a sad one. I suspect you are not in the best of health and consider yourself and "old" 60. I have kept myself in good health because I am aware of staying healthy. I consider myself a "young" 64. Since I plan to see my 105th birthday, I have 40 more great years left to go and beginning the clean-out for my passing won't happen anytime soon. It is not uncommon for people who undertake those concerns as to getting rid of stuff before they die can actually be bringing to fruit their own concerns - their death. Hope for the future and the fight to live fully has seemingly died, and so do they.
I have people ask me how old I am and when I tell them, they are surprised and think me younger. It's all about spirit and possessing an appreciation and joy for living that you do not want to throw away to the wind because you ACCEPT being old. I see many who are indeed younger than myself who look much older and are in bad health. They give in to the thoughts that they are old, are not happy with their lives, accept their poor health as a normal aging process and grab another drug to counter it rather than to not accept it and fight back. Your perception of life is what creates your reality and your beliefs of yourself and the world around you creates your behavior, and your response/reactions. One can get really wrapped up in the happenings of the outside world that they have absolutely no control over, nor any effect on, and with the wrong perception not be able to separate their emotions/reactions from those outside influences - which are in reality meaningless to them and their lives. I live each day without expectations - it may be a good day, or it may suck, but then there is tomorrow.
Live your own life, not anothers. Creating memories is all that you are ever going to take with you when you leave this world. It won't be the money or any stuff you have accumulated in your lifetime. No one will ever remember you or what you did or did not do, what you said or did not say, how you acted or did not act, what you believed or did not believe, 50 years after you are dead. If you are lucky, you may have some family members who have a rememberance of you, but soon they too will be gone and all that will be left is possibly a grave marker and a branch on the family genealogy tree.
My point? Live you life for you thinking of yourself - be somewhat selfish because you were put here to live your life and follow a path already made for you. All those things your dad had were things he enjoyed or made him feel alive. I don't think he intended his stuff to become an emotional burden to you, but perhaps provide memories for you to enjoy of him and then share those memories as "good," not emotional, and then pass some "good" memories onto your children - IF they are open to it, because your emotions and memories may not be the same to them as you perceive it to be.
My parents are in their late 80's. They downsized for convenience, not because of age, as the house was becoming too much work after they retired and they no longer wanted to do all the lawn work, winter shovelling, house cleaning, and home maintenance. Downsizing included getting rid of stuff. It was not because they did not want to burden us three boys with sorting/throwing out their life's collection of those things that meant something to them, but rather, because they wanted to LIVE - yes, be free of the house and much of the no longer needed extra things, so they could live the smaller condo life and travel, sight-see, go on cruises, take day trips, going out for eats/coffee, enjoy the social life and events of their condo community, and be free to do as they please rather than be tied to the things required in home ownership and those hours of their lives that could be better spent doing "fun", or nothing at all.
My parents asked us boys if we wanted any of those things (stuff) they were getting rid of. My brother's got a few items they wanted. I told my parents there was nothing they had that I wanted - it was their stuff, the things that they liked and kept around, and that I had enough of my own stuff/junk and didn't need to add to it. If they had had something I liked, I would have grabbed it, but we have different tastes. Told them I just wanted the cash when they passed so I could by an old hot rod coupe! That's not working out too well as I may not see my cash inheritance if they keep looking to hit 100 and use up all my inheritance on their "fun" and coffee/snacks. There is nothing I need of or from my parents, stuff or money. I will always have the memories and some are "good" and a number are "not so good". I don't get very emotional and when the time comes, all of their "stuff" will be given away, donated, or tossed out.
So maybe it is too soon to be sorting through your dad's stuff because there has not been enough time emotionally to get over your loss. I have seen this before and then there are regrets that things got tossed that they should have hung onto or should have given away or sold to another who may have needed or appreciated it. So those things you toss out because you feel you don't want to "burden" other family members should you die, may be the wrong thing to do at this time. It will really suck when your kids get older and have a better understanding of life and what THEY view as important and want to know where "grandpa's" X went or what ever happened to that thing you had that they now find interest in, or a memory in them.
Just sayin'. You have heard the saying, "The only way you will take away my gun is to pry it from my dead fingers." Well, my saying is, "The only way you will take away this solid lifter flat tappet cam is to pry it away from my dead fingers." I am not going to clean out stuff or get rid of things as a convenience to my kids - it'll be their problem, or fortune. Just DO NOT OPEN the pad-locked box that says "Adult Toys." Throw it away immediately.