Chord Progression

I am working on the C chord and the progression from G to C. And then trying to hop back. Each chord starts to work after a bit, but the progression is painfully slow. I'm trying the strumming pattern d-d-d-u-d-u-d, which is a nice pattern, but when one chord sounds good, and I can't get my left fingers in place for the next chord, it's so painful because I can hear the song in my head, but the sound doesn't come out of the guitar properly.

I think I am going to practice the chord progression without strumming so that I can build some muscle memory as well.

H.