I have done all the motorsports mentioned and didn't take any "backup."
You just have to feel confident that your car is set up properly.
As to the Skidpan and LVMA, I would pay double for the Skidpan, but I wouldn't want to do the LVMA again as it was too harsh on the tyres for the minimal time on track. While the Skidpan was very easy on the car (except the cleaning required afterward!) It is the best fun I have had in my car so far and as to some cars being too loud to participate, I feel sorry for the GTR's as they come standard too loud, but the rest of us knew there was a chance this would happen and now that we know, a temporary silencer is a small price to pay and you won't go over 3000rpm's anyway! The Skidpan would have to be one of the best teaching methods you could ever do. Sorry for the long post but I want SKIDPAN!!!