It you tile already to a good standard already then don't waste your money, I have learned more of fourums like this.
If you can't tile at all then it's a good starting point "the basics". Forgive me but I did learn a few tips from the guy who taught us - how to scam & rip people off, one of his favorite sayings was "you'll get away with that", basically he taught us to tile how and what he would tile, if it was too difficult he would tell you to grossly over charge. the best thing was that we had a 20kg bag of rapidset for a group of 8, it wasn't enough and we ended up blagging it out with plaster!!!!!!!!!!!!
We were told to proundly present our certificate at tile shops to get our discount, to be honest I feel ashamed to, and they would probably laugh me out of the shop.
Andrew