Garmin G1000 Resources
The short version is that learning the G1000 is difficult without some sort of tactile training device.
Using two iPads running the PFD and MFD apps from SIMiONIC, you can have a really nice trainer at home. The downside is that it costs ~$1600 and that's without the iPads. There's also a similar setup from RealSimGear but they use traditional monitors that need a computer flight sim to run.
Why use something like the SIMiONIC hardware?
Don’t let your button-pushing skills degrade to simply using the Direct-to key and on screen keyboard.
The plane is a terrible classroom, even Garmin says so (excerpt from G1000 Pilot's Guide 190-00952-02 Rev. A, p iii):
“WARNING: For safety reasons, G1000 operational procedures must be learned on the ground.”
It's best to practice on something with real knobs and buttons so you can get them into your muscle memory. Otherwise it can be really frustrating trying to navigate through pages, menus, submenus, checklists, entering text, etc.
Review of SIMiONIC G1000 hardware from the Association of Flight Simulator Builders and Instructors
G1000 Learning Resources
G1000 PFD and MFD emulator apps for iPad - SIMiONIC
$10 for each app and $6 for synthetic vision add-on
Garmin G1000 Checkout Course (Online, App and TV) - Sporty's
$99.99
G1000 PC Trainer - Sporty's
Free
Flying the G1000 - King Schools
$179
G1000 Glass Cockpit Handbook - Max Trescott
~$35
DA40NG G1000 NXi Cockpit Reference Guide - Garmin
Free
DA 40 NG G1000 NXi AFM Supplement - Diamond
Free
Further Reading
Simple overview of the G1000.
Hour long G1000 Garmin Tutorial
Pretty much the same as the brief Sporty's video above.
G1000 Glass Cockpit tutorial - Start + Run-up
AOPA - Technique: Quick Tips for the G1000
Software Tricks from the Experts
Note: The article is from 2011 but the tips are still interesting.