Dan, I've only ever tried windsurfing once and I suck at it, but kite surfing as apposed to wind surfing is a totally different animal. In wind surfing your learning the skill of board and sail at the same time and in kite surfing, it's 90% kite skills to start with, one factor being, you get separated from the board often in the early stages. You need good kite control to retrieve the board and the ability to body drag proficiently.
Best advise I could give: Get and instructional DVD to scope the basics, If you haven’t already done so, go down to your local spot and just watch and have a chat to the locals. When picking a kite school/ instructor, pick one that you can still use their gear (free of charge) to practice on once you've had your lesson(s)at the site.
After your initial lesson(s), you should know by that stage how you feel about your progress and what (or if) kite you should buy. I was a slow learner and advanced to quickly to the board in the early stages due to impatience, don’t make this mistake. Once you've had a lesson(s) and purchased a kite and turn up a site, have a chat to the locals and get the run down of the spot, explain your new and could they give you any pointers if your having difficulty's.
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RAL INN what do you weigh? Only persons 90-95kg or above should be posting in this thread.
"It’s a sad day indeed", think I need to hand over my policeman’s badge.

Forgive me Greenpat, I'm only 80 kg.