I’ve been doing my own crew cut for about 5 years now. I have a double cow lick that grows very fast and in 2 week I look like the Klingon Worf.
I use a #2 attachment and go around the ears. Next I do my neck (upwards as against the grain will be shorter). Then left to right (all the way). Then right to left. Front to back. And finally back to front. I do the outside on my back deck without a mirror. Final step needs a mirror and that requires taking off the attachment and trimming around the ears.
I finish up with a shower and a splash of homemade bay rum.
OK, how do you make homemade bay rum?