When you are filling out the forms you want to emphasize the difficulty and not the ability. So if he can go to the grocery store but needs a list, has trouble finding items in a familiar store, forgets items on the list and is so exhausted after the trip that he requires a 3 hour nap you want to describe that and not just answer yes, he can go to the grocery store. It's all about the difficulty level. There are even things I marked as sometimes able,sometimes require assistance (for me that's paying bills).

I agree that you should seek an attorney. I did mine alone and won on the first step. But once you need to appeal I think an attorney is a necessity and will help you know how to help your husband present his needs most effectively.