Wherever in your belly fatHow big are your pins tho? I've used 1/2" slin pins for delts, although it's nothing crazy I still don't know how I feel about pinning those everyday lol.... Is the belly the only spot?
A 29g or 31g is sooooo thin. I do it in the middle of the night when I get up to pee. Pinch the skin, poke it quick and you're done. Hurts more to pop a zit