Okay first off, yeah, you aren't supposed to talk about any kind of DIY here.
Secondly, if he has done improper piercings and done them carelessly before alone would make me not want to get pierced by your friend. If you go to a professional and see that they've done crappy and careless piercings before, you wouldn't go to them.. Probably another good reason not to get this DIY.
Third, Getting any piercing can be dangerous if not done correctly. Infections, poor placement, nerves, etc.
My vote is for a no.
Edit: that looks better.
.Madelaine.
I make money, money dont make me.