Use the 32mm wrench to remove the fan and turn the engine with a wrench on the crank bolt, this takes what? 3 minutes? Turning the engine with the fan nut is just asking for trouble.

There is a pointer on the front of the engine and a notch on the crank, it will be clearly visable with the fan removed. Yours may even have degrees marked on the crank, either way just like up the 0 on the crank with the line on the front of the engine.

Use whatever method of adjusting the valves that makes the most sense to you, every ones system works. just make sure they are consistent.