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No not really, or not any more than when you stretch your face. If you are interested I have a video on youtube showing how I shave my head. Just do a search in youtube for for JimboSRP. It's poor...

Whatever works for you. I like to have both hands free: one for stretching, one holding the straight (obviously!). I suppose you could rig up a second mirror but it's a lot of what my grandmother...