Watch the Quick Chord Changes online guitar lesson by Tommy Emmanuel from Fingerstyle Breakthroughs
Now let's work on your chord changes by playing through this exercise together. It's important that you put in the time with your metronome first so that you can play through the exercise in time and the notes ring clear.
Use this playalong video as a test: if you can play along with me at this tempo, you'll have built up your muscle memory to a point that you'll be able to pull off the parts that use this technique in the repertoire. If not, keep working with a metronome at a slower tempo until you can. You'll get it!