I usually ask my girlfriend or mother to cut it with scissors, then touch it up myself with scissors.

Yes, I know what you mean - going to a hairdresser.
However, if the worst comes to the worst, I can always go to a hair club salon. Surely, you cannot feel embarrassed going there. I know someone who does cut ins on hair systems, so if I had to go to a salon, I'd go there, not in a normal salon.

The robocutter could be a good investment, but so far, I'm sticking to scissors and thinning scissors.