Especially for P0, it is absolutely easier than you think it is - just don’t go too deep. So that’s somewhat relieving. DO THIS POSITION FIRST.
Other positions on the top of the hand are likely to bleed a lot more as well - not worryingly, but much much more than P0.
Understand that once you start you pretty much have to keep going, so be ready to commit to it. You don’t want to break the sterility of the needle and implant only to give up.
Go deeper than just the length of the implant - at least half a cm, probably more - I think there are recommendations for this somewhere.