Hey Polar, I can try to answer some of your questions. I've flown on the steam gauges for 60 hours, and now the G1000 for 60 hours, and now I'm alternating between the two. I prefer the G1000 hands down, it has so many helpful features.
It has a redundant screen. If the PFD dies, you hit the emerg. backup display and the AHRS will load on the MFD screen. If both go out, you use the standby instruments which are powered through a seperate static system and use the magnetic compass.
Each flight school does their own G1000 training, I used the King Schools G1000 course and roughly about 5 hours of dual to get used to it. I haven't even begun the IFR portion of it yet, but there is a LOT of stuff to learn. I haven't really come across any training about mismanagement, but I have made a few mistakes while flying the G1000 that I know I won't make again. One time I was flying over the coast and was turning back towards PIE, so I scanned the area just before I began a standard right turn towards the airport. About 15 seconds after I started it, the traffic awareness in the plane went off, I glanced at the MFD quickly and noticed that the other aircraft was right next to me at the same altitude, what I didn't notice is that I had the map zoomed out quite a bit, so it showed that he was right next to us. Needless to say, I panicked a little, but thankfully nothing happened, I started a sharp right climbout and never actually did see the other plane.