if you are adding height to the seat , it is not to hard, if you have to cut down take it to a professional,. I added 4 " to my seat and cut out the round bump that fits over your helmet when in the metin box, and I used rebond foam, 10 lb. per cubik foot,. and I moved the butt stop back about 5 "now I can ride for a couple of hundred miles and take a walk when I fill up with gas. then do it again, 81 years old , cant hardly walk but I can ride all day,.