i did a course with highly recommended course from a tilers forum about two years ago. and went on to do a few tiling jobs and still do a bit now, but i find it to time consuming to do any regular work, also the custys expect you to do the plumbing. joinery and every trade that gets involved and none of that was covered on the course, but to be fair i can definetly lay tiles confidently. as far as cost you will need a minimum of £600 worth of tools and the training can cost from 300 to thousands