Don't get the wrong impression, alot of the RNs I've worked with wouldn't get mad if you said that, but they might still want to teach you their way. As long as they aren't causing real or potential harm to the pt. the way they perform the procedure I would just watch and take notes.
Honestly, short cuts can be your best friend on the floor.
Just take notes and then determine how you are going to perform the procedures when you get out there.