Hey, sorry im late to post in this one, been a head shaver for around ten years. I had to wear a hat in work at an old job and hated the state of my hair after work, that and as has been said, it was gonna happen anyway. I started similar with electric shears on the smallest guard, then changed to no guard, then razor, really nothing to regret about it. My haircut looks perfect everyday and i dont need to go see a barber or hairdresser to get it that way.
I tryed using a straight for a while and it was great, but when i slipped, i slipped bad, took a really nice chunk out of the back of my noggin and went back to my old safety razor.
Then i started using that headblade thing, i like it but tbh after years of use i would say it has no huge benefit over a regular safety razor, i just use it because it lives in a little cage in my shower so i can just jump in the shower, get washed and shave my head in the morning with minimal planning.
I also agree that using a mirror is pretty useless, you learn pretty fast that its loads easier to do it by feel.