I can't recommend actually taking your new GNS480 into IMC
until you've become pretty familiar with it, though.
Spend some time with the Windows simulator to get comfortable
using the menu structure. You'll need to learn where everything lives.

I have started to read on how to use the 480. It is a very long learning curve,
but nothing that I cannot handle. Give me a few months and I will have it down
pat.
I never would get myself into a situation that requires IRF approaches with the
480 until I have it mastered. Still have my VOR and ILS.
Hank