i have been shunned in goodsprings for pickpocketing, how do i get unshunned. any help!

Have you tried doing quests AGAINST the powder gangers?

Also, make sure you're not wearing any armour/clothing to link you with a faction when u do the missions.

Depends how much you have done so far, you could just load a save from before you pickpocket. As a rule of thumb, its always best to save before you do something like that.

You could try to get back into their good graces by doing good things for them, like fixing Trudy's radio, or saving the girl on the tutorial mission with Sunny when killing the Geckos for example.