Where abouts are you racing? It will probably be what we class as 'hilly' (roleystone by any chance?). Whatever you do, keep your HR as low as possible, allowing others to do the work if they are forcing the pace and you aren't chasing anybody. Not sure what grade you'll be racing in though. Also, be confident with your bke handling, we recently (Sunday) had a club member shatter a hip due to some suspect bunch riding. (I ride down south in bunbury). Don't panic, ever.