I have to do it in sections. The top is front to back, the back I shave up the back of my neck all the way up. The sides I go up my sideburns all the way to the top. Once it's mostly gone you can go the opposite direction (or any direction you want) to make sure you got it all.
For you guys that shave your head, how do you get it all?
You can feel with your fingers, it's pretty obvious when you miss a section. Your scalp is extremely smooth, even a slight stubble will feel MUCH different. I also do mine twice, once slowly & carefully, & once afterwards quickly to pick up anything I might have missed. No mirrors required, I do it in the shower.
And no, I don't put anything on it other than a very, very light layer of vaseline.
Pics from the first time I did it, a year ago Two Three
Bad pics, & I don't wear glasses anymore, but that's all I have for now.
That was mid December, BTW, & the first time I'd ever taken a blade to it. Thus the pure white.
Viper GTS