Keep your igloo cooler with 2 months food supply towards the back of the flightdeck, or on top of your flightbag or behind your seat, I'm OLD and not nearly as limber as you are. Don't want to break a hip climbing into or out of the seat.
Express interest in Captain flows. Participate in decision making re MEL's, Fuel, alternates..etc.
Always try and encourage the FO to think like a captain, especially once holding comes up by asking them what our BINGO fuel number will be and why?
I have asked many captains what the hardest thing about upgrade was. Without a doubt, dealing the the FA's is the most common answer.
Ask the captain if you can do the crew briefing to get use to it and feedback on what could be included. Ask the captain if you can do the PA's on the ground. Try and get to the lobby 5 min prior to van time, so you don't keep others waiting.
That's all I've got, good luck during upgrade!
if you want me to be in the lobby 5 prior, schedule the van for 5 minutes earlier. if the hotel won't do that, call a cab. i'll see you on the van at departure time.