Mama,
The best way to get help is to start with the attorney. An assistant will likely handle your whole case unless you get denied. Then the attorney comes in.
As I recall, when the docs fill out the paperwork, they attach records. So you should not have to gather up too much.
Make an appointment to see your docs to have them fill out the paperwork. Make a 30 minute appt and pay them. Have them fill it out with you sitting there. It is highly unlikely they will do a great job if you ask them to fill it out on their own time. Plus they can ask you questions as they fill it out.
You will likely have an interview with a doc from SSDI. Be REALLY honest with them. Don't over or under exaggerate your symptoms and situation.