I am an incompetent violin player, but I'd like to sound a warning. I knew a man who was one of the best fiddlers I've ever met, who insisted on playing without chin or shoulder rests. He has a very long neck, and the doctor told him that his style was doing him harm and he should play with a chinrest at least. He ignored the warning and ended up in hospital. Make it comfortable, and don't do without the rests except on special occasions, or you may end up with only a mandolin for comfort. You may find you can play without the rests, but don't make a habit of it.