Watch the C 11 add 9 Tuning online guitar lesson by Vicki Genfan from Essentials: Open Tunings
Take your time with each of these techniques until you feel you've gotten them down before trying the whole etude. The techniques that may be new to you: Thumb Slap, Body Percussion, Harmonic hit. Be sure to notice the change between the first 8 measures and the syncopated version of that. Feel free to use a metronome and work at pretty slow speeds at first to make sure you're getting the feel and the groove. There's a slight swing feel.