My first Ironman

These days I am wavering back and forth concerning the Ironman distance. One day I feel strong and the next day I feel quite frightened. Can I do it? should I better quitt? Am I really prepared?

For now I am focussing on "superior biking fitness", which one of an Ironman-guy suggested. He said, that regardless how fit you are on your feet, you first have to cover the biking distance.
I read an interesting article on First Ironman? The Ten Most Common Mistakes - By Ray Fauteux .
He mentioned:
(1) OVERTRAINING: rest vs. performance vs. untrained muscles
(2) POOR DIET: supplements vs. balance vs. energy
(3) IMPROPER FINAL WEEK PREPARATION: Plan, relax & eat normal food
(4) IMPROPER PRE-RACE HYDRATION: clear urine the week before racing
(5) IMPROPER RACE-EVE PREPARATION: Rest is the order of the day.
(6) POOR SWIM STRATEGY: Avoid the crush.
(7) MISTAKES IN TRANSITION: Take your time.
(8) GOING OUT WAAAAY TOO FAST ON THE BIKE: Relax!! Don't eat or drink for twenty minutes or so.
(9) ABSOLUTELY NO RUN PLAN: Do long run-walks in training.
(10) ABSOLUTELY NO EATING-DRINKING PLAN FOR THE RUN: have a plan that you've thought out long before race day

There were some new hints for me, e.g. doing run-walks in train.
Maybe I just have to do it.
Happy training, T-IM