Pacman77
Have to agree with EveG queries/concerns.
Kokoda is not a simple walk in the park that you can go into without thorough preparation. At least 6 months of training and preparation is vital to ensure that you are not choppered out on the 2nd day!
I would hate to see your enthusiasm for the track turn into disappointment from not completing it.
Please read some of the other forum topics for help with your preparation before setting off.