This afternoon I decided to try driving. I drove to a nearby shopping center to buy a few things at the drugstore. Here is how it went:
First, it was a little painful getting into the car. Not too bad, though.
Then, when I got on the road I found that switching from the accelerator to the brake called for a bit of a twist of my foot, which was painful. Pressing the accelerator was not too bad but a bit uncomfortable.
My conclusion: not yet ready. Need more flex, less pain. Perhaps in a week?