Learn and practice your scales daily. Don't look at your left hand (if playing right handed).

You can't look at and think about chord changes they must be second nature.

To learn the alternating bass mentioned above:

Sit and without looking, start by striking with your thumb pick first the 5th string and then the 6th string while playing the C chord. Do this until you can talk to someone or sing a song without looking or missing a beat.

then add a pinch, 2nd string and 5th string, to replace your 5th string strike. When you can do this will talking or singing without missing a beat, PM me and I'll give you the next step.

Chance