Keep the cockpit tidy. Too much paper floating around makes life awkward, especially if you are wearing a visor or vision limiting goggles.
If you don't have standby frequency radios, or even if you do, make a list on the side of your flightplan of the expected radio frequencies in the order you will need them.
Biggest part of the early nav exercises for me was in staying ahead of the aircraft especially on the homeward leg. Pre-plan as much of the exercise as possible before leaving the ground, things like top of descent points, holding point sector entries, minimum sector altitudes etc.
Good luck and have fun. Don't get disheartened after the early exercises, it gets better.