This really isn't the case with ssdi attorneys. They work on contingency basis, meaning they don't get paid unless they win... So their objective is to win. They take 25% of whatever the backpay amount is. This 25% is automatically deducted from the backpay. This is common practice for an ssdi attorney. If the attorney you speak to doesn't work on contingency basis then you need to find someone else.

My advice would be to let them take care of all the filing and paperwork for you, since their familiar with ssdi law, and know what information is relevent to ss. You're qualifying for disability is based on if you meet the social security criteria... not because your doctor says that you're disabled. You can read about ss criteria by googling social security blue book.

There are people who win doing their own claim, but there are also many who have lost and lengthened the process because they tried handling it on their own.