Very simple solution!!
Get yourself a copy of Microsoft Flight Simulator.
Radio Navigation on this is just the same as in a real airplane. However you might want to restrict yourself to the same instruments you have available to you in your real plane, and not use all the one's provided in MS FS!!
I used MS FS before I started flying for real. It ment that I was familiar with all the instruments, and there use, especially for radio navigation, before I ever got near the cockpit.
Obviously your instructor will teach you correct proceedure for using them, but having used MS FS first, will mean you will pick it up very quickly, as you will already be familiar with them.