Yep Wavesailbill. I could give you a lecture on chop at Invy. It might be known for its flat water but when the tide is flowing it runs 5 - 8 kts. It flows in with a swell and with the wind blowing the opposite way we get a diamond shaped chop and visa versa I have seen it as high as 600mm on a 20 kt day. I have also see Kato disappear in the stratisphere doing some chop hopping one day - showoff

But back to your question. I believe(and I will have a few people disagree with me) that it is best to learn on flat water and hone your skills then step up to choppier conditions. Then I will state the opposite that I have heard other windsurfers say that it is good to have a bit of chop to help you turn the board?? Do what you feel is right and if it does not happen for you try the other way
Lessons are always a good thing and I am sure RPS, SHQ and the Zu will help you out. The other thing is to hook up with a few of the Invy crew when we are heading out on a 15 - 20 kt day. We have some good gybers in the crew but not me

I have perfected the STEP gybe. Step off the board, turn it around and get back on