I rented a G1000 equipped aircraft in Colorado in 2007. They told me in advance that they would have to check me out on my knowledge and ability with the G1000 (I had no experience of it before then). They recommended that I get the King Schools DVD called Cleared for Flying the Garmin 1000. I did the DVD course at home. When I did the check out I had no problems. I was familiar enough with it to be able to use most of its features straight away. I was flying VFR. The DVD also deals with IFR procedures. Well worth getting.