lol.. than stop scaring the hell out of a guy whose trying to do the install. no really, the tool is selp explanitory, pulleys are a great mod (remember $ to power and fuel mileage ratio), and your acceleration will inc. ill give my piece of info.. REMEMBER to put the cap on the end of the long bolt to the pulley puller! when u get it youll know what i mean.
I've seen very few horror stories on 2v 4.6's and the ones I've seen were install related and fixable.
4v's on the otherhand are a different story. The smaller damper is not a good idea for anyone that plans on spinning the engine up to 7k, and it can shatter the oil pump gears from the vibration.