Originally Posted by J S Machine
Trust me, you will probably not get the old stuff off without bringing everything with it.
True. If it was done right, it's all gonna come down. If it was done wrong, you're gonna want to take it down.
While it is true you want cement board underneath, there is more to properly building a shower surround than just CBU, tile and grout. Here's a start:
If you haven't dug around and found them yet, there are two sub-forums here, one on Kitchen and Bath remodeling (under remodeling), and one on Tiling (under flooring) you might want to take a look at. They both have a lot of good info.