A couple more points from a retail point of view.
Many of the guys on here are right at the top of their game - many of the "Tilers" that come into my shop and into many peoples' homes are, unfortunately, not. They therefore do need advice.
When dealing with householders we often like to give the customers a few pointers to make sure that their chosen tiler knows what he is doing, to try to avoid some of the disastrous tales we hear about on this forum.
Most retailers will be visited by Reps - who will pass on information about new products etc. It is then down to us to inform you guys, so you can start using these products. I'm sure that only a handful of you know what the new Tilemaster product is . . . .
I doubt whether any of us claim to be experts in fitting - we just try to accommodate everyone, experts, cowboys and homeowners.