Removing the tolex is not that difficult at all...just pull it off. But try not to rip the tolex: get it off in one piece so you have a "pattern" to work from when measuring to cut the new tolex. Purchase enough tolex so you have a few inches of play on all sides, to compensate for mistakes. There will be a lot of residue left behind (including glue), so sanding might be necessary. Be sure to tack off any wood particles after sanding, so the glue and tolex have a nice clean surface to bond with. I use Elmer's Neoprene-based Contact Cement, an even layer on both the wood and tolex. Smooth out as many of the air bubbles as you can while the cement is still wet. You will find that the tolex shrinks to form over a period of a few days