the mechanic that installed mine said "If I didn't use the directions it would have taken way less time and been alot easier". I looked through them and it didn't seem hard, just time consuming. If I had my honda that I have now I definately would have installed it myself, even if it did take two weeks. Then I can be sure that I wouldn't have broke both the headlights and the radiator. and the drive shaft would have been perfectly straight. I have to bring machines into tolerances under .000050" every day, the drive shaft would have been simple.