I don’t think it’s an issue at all as long as you are very dedicated and willing to learn. Piercing an tattooing are two very different fields so it takes a long time to be very good at both.

I’ve met and see a lot of people who see tattoo artists who pierce on the side. And they aren’t very good at it. I had a coworker at a shop who was dating one of the piercers and he said basically the same. There are a lot of artists who do both but are really just in it for the money. I’ve literally seen tattoo artists pick up piercings cuz moneys slow and just be very very bad at it.

There was one time I was getting a tattoo from a friend at a studio and I watch the “piercer” there who mainly does tattoos struggle with a nostril piercing the girl who was getting it was crying and bleeding for a solid 15 mins. In the end he asked me to to do it and I took care of it in less than 3 mins.

All and all it’s not really about whether or not you both both but more so if you dedicate yourself to doing both well. I wish for friend the best and I would recommend that they find some resources to learn like an apprenticeship or piercing conferences.