As a straight guy that started painting his nails, I can assure you that the entire process is surprisingly simple.

Buying nail polish? Hmm, he must be buying some for his gf how nice.

Wearing nail polish? No matter how vibrant, I have never had someone notice my nails unless I have had actual prolonged exposure to them, in which case they almost immediately assume it is because of a girlfriend or daughter or something.

Most of the time people don’t notice, it took my boss two weeks even when we work next to each other pointing at things on a screen regularly.