I think Flying Bull is on the right track. Practice, practice, practice. Take every opportunity to fly IFR procedures, particularly if you're new to the game. While you have quiet moment on the ground look through some unfamiliar approach plates and do the "what if" routine:
"what if I'm told to hold" "what if the G/S fails" etc.
And remember ALWAYS have somewhere to go if the weather closes and it helps to have the fuel to get there!
Good luck
Wiz