As royal oak has pointed out all depends where you live .
1. you are going to have to go and buy tile cutter and associated tools for the job look at about £100 maybe .
2. the tiler in his charges has to pay for tax,ni,petrol,advertising,servicing of vehicle and non paying r sole customers and lack of holiday and sick pay, pension contributions so at the end of it how much is he gonna walk away with. I keep having to explain this to my mum when someone comes to do something then when I explain it she then understands.
3. If you floor is out as per one quote saying he's gotta use self levelling compund, can you use these products?? My dad can do almost anything rebuild engines,cars bikes trucks, weld stick and mig,respary cars,has rewired a house(not a sprky by trade) replumbed a whole house(copper not plastic) inc the gas, the registered plumber next door came to give his seal of approval for building regs said it was better than most plumbers he has worked with who have been doing it for years , almost everything he has a go at comes out wicked ,
He had to use self levelling compund mix it himself using instructions on the bag and he just could n't get on with it . luckily it was in a shed so a nice finish wasn't to necessary. I can use it but wasn't around when he needed it doing.
you can mess with it too much if your not carefull too.
Have you tiled before ??
Ill give most things ago too like your thinking, but if it goes to sheeeite it's gonna cost.
Good luck though
). 
