Thanks for your great advice.
I went to Jinny Beyer's Studio yesterday and tried on a T. J. Lane thimble and immediately fell in love with it. It feels like part of my hand. As a matter of fact, I liked it so well I also bought one for my quilting finger to replace my Roxanne. I did a little stitching in the shop with both thimbles on and I think with practice I can do this. I also own a Thimblelady cone that I trade off with my Roxanne -- depending on the size of my finger any given day. I assume we all have hands that change sizes with no recognizable reason. I admit that I was a little concerned that the Lane thimbles were thinner, but it's good to know that I can get it repaired if necessary. Now, I'm excited to start practicing with my thumb and maybe I will eventually be able to quilt in any direction.
Thanks again for your input.