I don't have it, but I'm pretty knowledgable about the subject. I'm assuming you mean clitoral hood piercing.
1) no they don't numb it
2) probably hurts like every other piercing
3) blood can happen any time you break the skin
4) there's many videos online
5) I don't see why peeing would be painful as it's not close to where the urethra is, unless you mean to wipe then yes it could see that if you bump it accidentally. But tight fitting clothing would probably be more uncomfortable