it's not bad but is very "crucial", you and have to be carefull since your dealing with the life line of the engine, and could possibly do alot of damage if done incorectly, also pull a search, there are a lot of threads about it, one tid bit though, the crank bolt is a doosey! will need masive air wrench or crank tool, took mine off with a 3/4" air wrench,