Hi again Kelly
Yes it is usual to progress to a special lighter boot after the cast and most people manage well. I didnt 'cos I couldnt manage the Velcro with my very damaged hands (have had RA 38 years now), but I had a 'walking plaster' and initially after 'non weight bearing' I was told to start by putting 25% of my weight on the foot - work that one out! basically it was what was comfortable with the help of the crutches and I got the hang of it very quickly.
Yes the op did work well. As the ankle was fused all the pain and instability had gone (it was the left one). I have had the other one done too, so they match! I had to give up driving unfortunately because of severe neck restriction (had two fusions).
As I'm not too big I had a 'junior' wheelchair which was very narrow and went through the doorways of our 1909 house with just a bit of paint scraping by me

.
It is absolutely natural to be nervous before an op, everyone is, and I always find in the couple of weeks before I just want to get it over with and start recovery. The waiting is often the worst thing. Do let the nurses know you are feeling nervous when you go in, they are usually very understanding.
Lots of luck again, sure you wont need it though,
Take care,
Liz