I would say some explaining is needed. Not all tippers realize the coins turn to real money for artists, and some get confused where to go to tip, or how to get free coins. That will probably get easier with time for most, though. I think its pretty straightforward.
However, it's definitely a little wonky that mobile users can't receive or give pms, which means you can't really contact them to hand out rewards. That means for tipping rewards you need tippers to either pm you themselves (desktop users) or e-mail you with their tapas user name (mobile users), so you can give them their rewards. Which is one advantage patreon has over tapas! However, if you're making enough in tips, it's not a lot of trouble.
Edit:
Went and found this, because its really helpful to those that want to make the most of tipping!