Ha ha I always hold the entry over the post box for a min or 2 as well! 
You wont regret it, its very well organised with special drinks. Yes its crazy tough but aint that the point??
As for the plod option its hard not to, I average around 3-3.15 for the marathon and I get to marathon point on this at 3.50ish so that shows just how hard it is. Dont be affraid to walk up the big steep hills and save your energy for later, trust me you will need it! just go enjoy it.
This is my 3rd time doing it, so this year i really wanna go for it this year I did 4.45 last year and really wanna big improvement on that. Just hope its not too hot and definatly dont want 4 hours of terrential rain like last year either.
good luck 210, u will be fine