Back of Neck - How do you clean up the back?

Everywhere I go I’m seeing GEM style razors, I think this is a sign...

I started doing my own haircuts just recently when salons were closed. I use a hand mirror and a de razor on my neck. It’s not easy for me to do myself but I get it done.

Like anything, it gets easier the more you do it

My wife uses clippers on my neck behind the head area.
 The situation is when she cuts my hair with the #2 guard and goes without the guard to this area.
I have to stop her from getting out of control and going all over my ape like hairy body, with clippers.

That looks excellent!