Yes, it does hurt a lot more to pierce through scar tissue. However it is very doable.
I suggest that if you want to get it done again, you buy some vitamin E oil (28 000 to 30 000 IU) and massage the scar tissue with it as often as possible for at least 3-6 months. Remember that it can take a long time to break down scar tissue and even then it will never completely go away.
If you can wait a while before getting it repierced, I strongly suggest this method.
Good luck!
_________________________
Sir, I'll admit your general rule,
That every poet is a fool,
But you yourself may serve to show it,
Every fool is not a poet!
~S.T. Coleridge