Well...if you can yank and bank, then flying straight and level is easy by comparison. Fighters do fly IFR you know. We also use CRM(inter-cockpit) and shoot approaches too! My a/c has no dedicated Wx radar, a two axis autopilot(not coupled), GPS with no moving map and does not sequence to the next waypoint automatically, etc. I also fly an RJ on the outside and it's much easier than single pilot IFR in a fighter.