K.I.S.S
Blokes i know in training would write novels of info to seat on their lap when learning IFR which is just more things you need to look at when simulating assy sequences to clog your already overloaded mind, IFR does not have to be made complex, in fact it is easier to fly IFR than VFR.
Think of the whole exercise as almost what you do already with a couple of extra radio calls and briefing an approach before your decent, with a couple of extra rules and alternate requirements to catch you out. In the real world of IFR in Australia, you will rarely shoot an approach for real, most is just for currency. The real world is giving a Taxi call, departure call, maintaining, Position reports and frequency transfers, TOD, copying traffic and canceling SAR. You are given all the frequency's, advised of alternate routes around airspace if required and a heap of other goody's that you will find out about as you make plenty of mistakes!
Just be ahead of the aircraft, and if your not, don't do anything stupid quickly!