I've never tried it but, like you, have only "heard it was possible". I've also heard it was very tricky to do. Given that you're doing this to replace the body bushings, I think I'd just "bite the bullet" and remove both the inner and outer fenders. Why? because the fronts of the fenders connect to the core support, so when you lift the body a little to get the bushings in and out, the fronts of the fenders aren't going to move. I'd be concerned about bending something you don't want bent. Plus, if you're replacing body bushings, are you replacing core support bushings too? If your body bushings have "flattened" and replacing them lifts the body a little, you may find that afterwards you won't be able to get the gaps along the front edges of your doors straight if your core support bushings have flattened also.