It's not a hard (as in complicated) job, but after doing the kitchen I understand why labor for installing tile is expensive. That's one reason many people decide to install tile themselves. The labor can be three times the cost of the tile itself.
Be sure to figure about 10% extra for waste and cuts (20% if you're laying the tile on a diagonal). Don't forget to install a backerboard if you have a wood subfloor. If you only have straight cuts, a tile cutter will be fine.
And be sure to research all you can on tips from pros, like JR6ooo4 suggested.