When I had my hearing I had "witnesses" who showed up in person. They carry more weight then "letters". Notorized
letters carry more weight than ones that are not.
My witnesses were former co-workers, a neighbor, my preacher & my elderly mother.
Notorized statements/letters from house cleaners & various friends.
If your "witnesses" are unable to show then the letters must be "notorized" & typed
If handwritten, just make sure the Judge is able to read it. Otherwise, he will probably overlook it.
I had an attorney which I didn't hire until the ALJ hearing phase which I promply notified SSDI after I was fully approved.
This way, I got 100% of my settlement. I only paid the attorney OOP expenses.