If you can't afford to go all out straight away, and the jobs aren't exactly piling up, you could always get yourself a "cheap" second hand unit from GUMTREE or EBAY, and treat yourself to hiring a nice cutter if a big job comes along? Then, once the dosh starts flowing, you can upgrade your kit. If you've got an INEXCESS nearby (one near me in Parkstone) sometimes the cheap bits like buckets, sponges, towels, hand tools are in there for peanuts.
Keep your receipts for any tools you buy, and make sure you enter them on your Tax Self-Assessment as your "setting up costs" so you don't pay tax on it all (if that makes sense!!)
Welcome to it, be prepared for a bad back (get yourself some top quality knee pads BEFORE you wreck yourself) and wear gloves for grouting or your fingers will all fall off!!
Good luck.