they are a good starting mod. a 25% ud crank pulley is the safest % unless you get an electric water pump/aftermarket alt. get a 96" belt, "gates" brand preferred, but they are expensive (~30$). a pulley puller from any auto chain store, and some ramps or jackstands are needed.
Its simple to do. I wrote a howto, you dont need to jack it up or anything. I removed the fan for more room. you dont have to, but i did, alot more room after getting that out. Esp if your using a impact gun.