Obviously great advice from Wahine.
Otherwise, you are a month out. Honestly, there isn't too much fitness you are going to gain in a month. This question should have been asked 3 months ago... ya know?
You will be fine though. Do the bike distance in training so mentally you are ready. Otherwise, just keep doing what you are doing and get ready to have fun at the race!
I didn't run the entire month before my HIM do an IT band issue. I couldn't even walk. I did one walking session of 5 miles on that month. I finished my HIM in 7:11. Sure, not fast, but I was happy to have a 14 minute mile on the run portion considering how I hadn't run the entire month before. I just got out there and walked as fast as I could.
Good luck! Go into the race with a "I can do" attitude and take in the experience! Remind yourself, "I am doing a HALF IRONMAN"! Take pride in that.. and let that help move your forward! Smile! Talk to people! Have fun!
"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!!!!"