I have my nose done and it didn't hurt me hardly at all - just a pinch and it made my eyes water. But then again, I'm really weird when it comes to pain like that. I have 13 piercings total (the other 12 are on my ears) and I did 7 of them myself, so clearly pain isn't a big issue for me. I have friends who have their belly buttons pierced and the reaction has ranged from "Not bad, maybe like a little pinch" to "OMG worst pain of my entire life, I'm pretty sure childbirth would be pleasurable compared to that" so it really depends on the person.
It all depends on your pain tolerance and your body itself. I've had just about everything pierced, including the back of my neck even and it didn't hurt at all - but I know friends who had their cartilages pierced and cried for a day or two practically.
If you don't think about them when getting them done, you don't even really notice any pain.
I had my nose done three times and my septum. The actual piercing wasn't too bad, the swelling afterward was a little bit sore for a few days. Felt like my nose had been bumped a bit too hard for a little while after.
Can't say I know what a belly button piercing feels like, but it didn't hurt when I got my stomach tattooed. In fact I fell asleep.
im not sure I would guess belly hurts lesss , but I've heard people say nose didn't hurt at all however the thing with a belly piercing [ that hardly anyone mentions ] is it takes time to heal , if you get it done during the summer and expect it to be fine in a couple weeks think again because it will be scabby so its best to get done in the winter time so you'll be ready for bikini season