Hi Allan
I have no experience of the operation but I did have a back brace, I had to wear it for a year but since then I’ve been fine (luckily)
It will depend on where the problem is with your spine as to how it is fitted, but for me I had to lay on my back whilst my wife slid it under me and it was secured at the front with velcro and straps that clipped either over the shoulders or under the armpits, again depending on how it needs to sit on the body. Once it was secured I could sit up and move around with no problems at all.
Hope that makes sense but by all means let me know if you need more info
Best of luck with everything
Paul