Watch the Changing Chords online guitar lesson by Rich Maloof from Acoustic Guitar For Beginners

Understanding how to play well and actually applying what you know can be two different things. Here are some tips:
- Work at your own pace. Don't speed up until you can play the rhythm and change the chords smoothly at the slower tempo. When you're ready, increase tempo incrementally.
- Keep a steady rhythm.
- Work on short passages of music. Break up what you want to learn into 2-, 4- or 8-bar blocks.