It was my first race at the begining of last year and I have to say everyone in the DD paddock was really patient, kind and will do their best to help you get it all sorted, but I have learned over the last year that most of the time no-one has much of an idea of whats going on anyway
But maybe a bit of good advice is to book into a pit garage, that way at least you will be around other DD racers all weekend.