Hi,
Take the opportunity and give it a go, you might be surprised and learn something new, got to beat guessing what they do doesn't it.
You might also find that it's not so much about them guarding things either.
The first IR kitchen I went into for lessons we made a cut down version of their base which we then made a number of dishes from. I asked to take a sample home from their normal big pot base home to compare with to make sure I was doing fine.
Oh, I also went their the Sat night before and ordered a number of dishes that we would make so that I could know their take on the dishes and ensure that what we made in the lesson was the same.
Went home and followed the recipe but it wasn't quite right. So I rang them up, talked to the chef and asked if I could come in and watch the big pot process from start to finish to work out where I had gone wrong. Next Sat I went in and found out exactly what I did wrong, it was actually a miscalculation on the cut down version, and went home and could produce exactly the same thing!
I also learnt too that using the Ashoka brand of Vindaloo Paste which I had in the fridge did not produce the same dish as using the Lashand Vindaloo Paste that the restaurant uses even though they had the same ingredients. So guess what I did, I went out and bought the Lashand Vindaloo Paste, all 5kg of it as it is made just for restaurants, lucky I like Vindaloo!
These things and many more I learnt in there which would never have come up without going in.
Cheers,
Mark