Without seeing how bad they are, it is hard to give clear advice. First thing to do is split the supers. Drive a hive tool between them and try to pry them apart without breaking. If they are too stuck together, if you can split them enough to get a wire between them, you can pull the wire across and cut the burr comb like a cheese cutter.
Once you have the supers apart, start with one of the edge frames and try working it out. Use a bare hacksaw blade to cut bur comb between the frames. Try and pry frames sideways as much as possible and not up. By prying up, you will most likely split the top bar from the rest of the frame. Once you get an end frame out, work your way one frame at a time across the super.
If they are really badly burred, consider breaking apart the the super and then cutting the frames with the "cheese slicer" wire method.
If they are not salvageble at all, and you just need to get the bees out, turn the super upside down and but a new supper on top. There is a good chance the queen will migrate up into the new super rather than lay eggs in upside-down cells.
There is no easy way about it, and you will killl some bees.