Watch the Diatonic Chords & Let It Be online guitar lesson by Vicki Genfan from Open Tuning Handbook: Rhythm
We'll be in the key of D. (Wow, I love these chords!) You may need to work up to the stretch in that vi chord...but it's worth the effort. Can you find some chords from songs you know using different combinations of these diatonic chords? Don't forget to check out the "additional" chords on your chart.