ok guys i have a 1999 scrambler 400 and i was wondering if i could do these at home or the dealer....im not that mechanically inclined but im decent so here the things im getting my scrambler is kind of stock accept i have a fmf muffler------a standard clutch kit from rick ritter, and im wondering if i could change the oil in the hubs and differential oil what types for each? then i am ordering the two sprockets front and rear stock so i was wondering if i would do these at home or dealer thanks so much...also i live in wilmington,NC if anybody lives close near there that could help me for a fee.