Flooring Tile - wall tile in bathroom

I'm thinking about installing cermic tiles on our bathroom walls. The bathroom is actually the master bath in the house and contains just a shower. It is not a really big room and there is good ventilation provided by a 110 cfm fan. I have a couple of questions...........
1 - Can I install the tile over the existing painted drywall?
2 - Will I need a 'special' wet saw to cut the tiles? I'm not planning on using really thick tiles......just the standard ones that are used for most bathtub/showers today.
3 - Is this something that is really tough to do? I'm pretty handy and do most of the work around the house myself........

Any advice/suggestions that you can offer is appreciated.

As long as the paint is in good condition you should have no problems, just give the walls a good scrubbing to remove any dirt,etc and let dry well. I'm assuming you are NOT tiling inside the shower as that would be different.

The tiles can be either cut with a wet saw or they can be "snapped" after scoring similar to the way glass is cut.

Tiling is a great d-i-y project. My first project (circa 1980-something) was to ceramic tile a kitchen countertop; came out very nice. Be patient and make sure you have everything as well-planned as possible as tile is somewhat unforgiving as far as un-doing mistakes. If you have a Lowe's or Home Depot near you check their d-i-y classes; they always have one on ceramic tile fairly often and will help you past any nervousness. Good luck.