Welcome! I have less challenges than you do, but I have mobility issues related to a pain disease. I also have a service dog, Josie. She is a 3 year old smooth coat Border Collie. She has made such a difference in my life! I've been training dogs for almost 40 years to show in obedience. So, I was fortunate and was able to train my own service dog. Now that she is fully trained in what I need right now, and has passed a couple Public Access Tests, I am working on more tasks just in case I find myself also in a wheelchair during her lifetime.
This is a wonderful site. I know you will make many friends here!