Mel,
Congratulations on signing up for your FIRST tri! Exciting stuff!
I know once I put my money down, my motivation goes way up.
OK... so... the swimming. Get in the water as soon as possible. You need to make sure you that you are good to go on that. As for open water, are you certain you are fine with it? Some people freak in open water, and don't know they will until they are there. You might want to get some open water time in as well.
Also, do some bricks before the big day. A brick is riding and then running immediately afterwards.
All right, good luck and keep us posted!
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"