Hey you don't nead to be qualified to be a tiler, just do a realy good job. You can ask advice on different adhesives to use and any other problems you might come accross. but once you start doing a good job for a fair price, you will be inundated with work by word of mouth. I know many superb tilers who have no written qualifications. Once you are established with a good reputation, you are A Tiler.
With any job its always best to start by taking your time, Speed will come naturally and with experience.