I've had one lesson - with instant results! The big point I took out of it was that i) keep your feet planted to the ground and ii) be relaxed and for now, don't try to power the ball off the ground.
It's actually worked. The weird thing (which I'm sure you all know - but it still something I have to get a grip on) is that the less I try, I better I hit it. The coach says that I have good hand-eye co-ordination due to playing sport all my life so that always helps. Plus I'm tall with long arms so again, it all adds up.
Next step, make sure I take the learnings and practice, practice, practice!