Marion,

View it as learning all over again. I've learned to play now three times. Just as the first time, you should go slowly, when it starts to be uncomfortable stop and rest awhile. Play sitting down with a straight back and good posture. Be aware of your missing callouses and don't over do your finger tips. You'll want to go faster than is good for you but take baby steps. Start playing with a capo on the fourth fret to limit the finger span rewuired for three fret chords and avoin barre chords for the time being.

BUT GO SLOW!

Don