You'll be fine Kate. Get yourself to Boots and get a tube of their cheapest lubricant. Cover your arms, legs and wetsuit arms and legs with it, and you'll slip right out of it. Are you doing the sprint?
My wettie is now 1" shorter in the legs. Rather jaggedy, but at least my feet will fit through.
45 minutes hard today on the bike, with 1km hard run off the bike, then 10min easy run. Sunday is going to hurt.