There are three phases to IR flying:
1) a proper scan
2) understanding the procedures (ie reading the approaches and departures and translate it to how it looks on the map)
3) situational awareness.
These three are on top of real flying for which you have to use the aircraft.
I have to agree that no1 is best done by using FS2002 and a book / instructor explaining all.
For No 2 and 3 Rant is very useful as it concentrates on only that. No need for a joystick as it is not flying you are trying to learn just aspects. The best part is to do a lot of training on phase 2. Only when you that works ok start removing the sircraft from the map and start new exercises. The figuring out of: Where am I, what is the request and how do I get there is the most difficult.
Once you have mastered those three go to a proper instructor and bring phase one to three together with the most exiting and expensive one: IR flying!