How do you remove a lot of wall tiles?
I tried the screwdriver and chisel technique with some tiles in a flat in Brighton... and quickly gave up once I found there were three layers of tiles there! So I invested in a cheapish power chisel - like a hammer drill, only it doesn't go around - and finished the job in a weekend. 

If you go this route, it's definitely worth buying ear defenders and a good strong set of goggles as tile chips are sharp. I used my chainsaw helmet and got a couple of dings in it.