Watch the Add Harmonics online guitar lesson by Vicki Genfan from Acoustic Rhythm Guitar Cookbook
You should have the picking pattern down at this point. Now...practice the harmonics! Make sure you get the touch and location right. You should be able to tell when you've got the right sound. Play the study slowly at first so you can keep the flow smooth. There's a bit of extra movement required in order to jump up to the 12th fret or 7th fret to get the harmonics. You'll need to think about that so you don't lose the rhythmic flow of the piece.