I do the same as Leslie...cut the hair above my fingers so as i use professional hair cutting scissors that are extremely sharp.
Max was taught at an early age to "sit still"and the word "up"
and i try to trim in him in the bathroom only so when he hears these words and sees the scissors he sits straight as an arrow and doesn't move unless i ask him to.
Peanut recently took 3 days to learn how to stay still and trust me.
We're working on Beau, seems if he's in his doodle pose he could care less then.
It takes a few days of trying before our doodles started to completely trust us, now they're easy to trim