Today, I decided to give it a go myself. I've done so once before, but must have been making such a mess of it that Janelle stepped in and finished it up. I was a little concerned that I would screw it up, but I also wanted to see if I could get it right.
The back was the hardest part as I had to go by touch. This was especially difficult for the "cleaning" of the back of my neck. I still don't know if I managed a mostly straight line. My boys were decidedly unhelpful in giving me advice or criticism. However, as no one ran in terror, pointed and laughed, or called the police, I think that it must be fine.