if the empennage (tail area) is a little off the plane might be a little off track but is not going to fly so out of control that its hardly flyable, before you tear the tail apart, check the Center of Gravity to make sure its balanced correctly.

do a range check, making sure your reciever didn't get dammaged in the misshap, it doesn't always take a hard hit to cause problems, one reason wraping it in foam is recomended to protect against exessive vibration.

after those checks you decide to reset the tail, loosening up epoxy isn't that hard, heat gun and a exacto works well to soften the glue.

what plane is it, this will determine the best method for repairing your repair, and photos help with the best way to go about it as well.

if the tail uses stringers, thin pieces of wood along the fuse to connect the tail they can be removed with a razor saw and replaced up the fuse.

if its a slab sided fuse, meaning a piece of balsa or plywood assembled in a box structure then the repair is fairly easy,also a dremmel moto tool comes in handy for this type of work.
biggest mistake made when doing a repair in the tail section is thinking more glue is needed for the area to be stronger, it just adds weight, better off applying a patch using the least amount of glue possable epoxy isn't always necessary CA or wood glue works well and tends to be lighter if the repair is done correctly clamps and pins work well depending on access to the area.

more information would be helpfull to determine the proper course of action on repairing the airframe if needed