Well Leon,
Since its the big day on Saturday, I hope you have your gear laid out ready? If you leave it till Friday night, I'll bet you forget something (I always do). I'd suggest getting clothes together (waterproofs, boots - they are clean and dubbined right - hat, knife, flint, brew kit, first aid kit etc.).
Check the gear over (looked into my EDC FAK today and notice my saline had split and soaked everything - sigh). Time for a new set of plasters etc.
If you prep your gear like this, you'll have plenty of time to make any corrections without flapping (sharpen knife, clean boots etc.). On the day it'll just be a question of picking up your kit and heading out without forgetting stuff. Remember what was inconvenient when you get back (like teabags getting wet in your pocket etc.). I for example now save all sorts of odd containers (small shampoo bottles for milk etc.) so that my kit is light but safe.
Don't forget your Mors K book (for Fenlander to get signed for you), your camera (cos you owe us all a proper write up of the day), a note book to write down what you learned etc.
Remember it'll be a learning day - the bloke who never made a mistake, never learned anything - you'll make tons of mistakes and learn loads (just like the rest of us). Next time - you'll still make mistakes (they'll just be different ones as you'll be doing still more stuff).
All the best
Red