Watch the Open G Tuning online guitar lesson by Vicki Genfan from Essentials: Open Tunings
Be careful not to rush the chords in the plucking section. The space between chords really helps the feel. Use the percussive sound of your right hand hitting the strings after each pluck to help keep the time tight. Take the ending section separately if you need to and really work on the syncopation. This is a great exercise for independence of your thumb!