It was easy.  I filled out the forms online, then authorized SS to obtain medical records of my surgeries, cardiology reports, details of the radiation treatment(s), an update from my urologist.  SS called me several times saying they wanted to speed up the process and asked permission to obtain several more pieces of medical records.  That was it.  Easy peasy.  To the commenter suggesting that it is a "government disability gravy train" - I will trade my health demons with you any day of the week.