Not doing the Xterra, maybe I'll give it a try some time when I have the funds for a bike, wetsuit and all the goodies

I did my first triathlon in Nyon on Sunday (without wetsuit and on a really old road bike).
I trained for swimming at Nyon Colovray, there is a pool and the lake is great to train in with lifesavers from 1pm. La Plage in Nyon is also very nice if you don't want to pay for entrance.
That's all the advice I can give. Will definetly be a spectator on 10 September in Prangins. Good luck with training and ENJOY!