As someone who got it done about two months yang lalu at Hairhouse Warehouse, it does hurt, but not nearly as bad as anda imagine. Then it'll sting for the rest of the day. oleh the selanjutnya morning, it doesn't hurt, though it takes months to heal fully.
Of course it's gonna hurt. anda are piercing your belly button, after all. It's only common sense that it would hurt a bit. As for how much, I'm not sure. I'd just go with what the others are saying. From what I remember when I got my ears pierced (which is somewhat similar) it does sting a bit afterwards, but it shouldn't bug anda that much a hari atau two later.
Every piercing will hurt. Obviously. But, I suggest to maybe go on youtube and look up video of people getting it pierced to see how it could feel. Ofcourse some people can take pain better than others, So..