Anna to reinforce what Jeff said, and for the reasons he stated.

I second that you should consider adopting the conventional folk finger form for open G major using fingers 1, 2 & 3. Using that formation, the change to G to C to G is actually quite easy with a modicum of practise. e.g. By concidence I've been playing it for the past 90 mintues practising nuances on strum patterns and arpeggio pick playing "Hallelujah", and C to G to C is so rote memorised and easily articulated that it's not one of the changes I even have to think about or experience any difficulty articulating. I have the entire song competently nailed intro, verse and chorus, but am ever trying to finesse.

That's coming from someone old enough to suffer mild degenerative arthritis in his hands, exacerbated by nerve pathway deficits affecting his fretting hand a consequence of two neck surgeries, and a fretting hand wrist which was fractured in a motorcycle accident years ago. So if I can do it, anyone can, ...if they want to. Haha. How I'd love to have that 18 year old body back.

Once you have those two formations sounding cleanly individually, it's simply down to repetition affecting the changes until seamless. There really is no magic shortcut to rote learning that everyone wishes for. Similarly to Jeff, I have smaller hands with characteristically endomorphic fingers as well with a relatively shorter than I'd like pinky rather like Lisa's, and neither G and C are difficult chords to finger even if they might seem it to you at present.

Characteristically the most problemsome chord for everyone are variations of open F and changes from it but even that passes with applied rote learning. e.g. "Halellujah" which has many to and from F changes, one just for one beat in the latter half of the verse.[br][br]As encouragement, I've been playing for less than six months, so it doesn't take long to attain competency.