Its pretty easy if you have a service manual (pictures are nice it shows every part of the carb) and if get a jetkit it will have instructions and recommended jettings for your mods,altitude and so on. These recommendations should still be checked but they will be pretty close mine where right on for warm weather but will need bigger main jet this winter i think. All that being said if you dont have much mechanical ability or have a hard time with stuff like that I'd take death's advise and have it done.