Complaining that you have only had 15 hours flight time is not an excuse and don't even try to talk to me about high workload....
I only had 15 hours in one to, and to be fair, there is no space in the IR syllabus for training in full on G1000 there is just so much it can do.
You do know the basics for what you need and a few shortcuts, but if someone went messing with the settings beforehand and its not covered in a checklist, then with the pressures of the day you can see how it would be missed.
Its not practical to sit in the A/C and 'play' with it on the ground, flattens the batteries to quickly, fotunately the school I went to had a G1000 sim set up on a PC to play with.
Wait until you try to depart a noise sensitive airport, using conventional naviation, dealing with flaps and speeds and ATC for the Pilot Flying, without infringing any of the regs, its bloody hard work.
Nice to have someone next to you to share the workload with then.