First of all, THANK YOU ALL for your advice and kindness in my last post. You are all wonderful people!
I took your advice of going slowly, and today I sat in the car (alone), played around with the lights, moved the mirrors and the seat.
My anxiety spiked, but reading your comments and encouragement helped A LOT. I spent around 20 minutes there, breathing and pushing buttons.
I can do this! Slowly! The most important step is the next one
My mum I short. She had a booster seat to sit in. And some people get pedal extensions added so the gas and brake are in a comfortable location.