If you have a large pair of slip joint pliers, using two scraps of hard wood between each side of the panel and the jaws of the pliers you can often straighten out the bend. Work slowly and with care. Good luck.
If you don't feel confident to do this yourself, I'd try a vehicle body shop. They have experience in neatening up bent metal.
I'd remove all the tubes first. You don't need no broken glass!