Pretty much everything but mounting tires. I have tire irons, but the last time I used them there was so much cussing the neighbors brought the kids inside and my wife thought I was gonna have a stroke.
My bikes are easy to work on because they have centerstands. The Suzuki uses shims on top of the buckets and the Honda uses threaded valve adjusters. The spark plugs are easy to get to, the carbs are difficult to get off and on the Suzuki because of the backbone, but the Honda's are easy. The Honda even uses a hinged gas tank and strut to make a synch easy. The Suzuki's oil filter is easy, but the Honda's fairing has to come off. I learned by working on two-strokes.