I found a very informative webinar PowerPoint presentation online that really goes in-dept on how to evaluate the self employed borrower. Has step by step instructions on a lot of different scenarios.
In-browser view: https://docs.google.com/viewer?url=http://portal.hud.gov/huddoc/psewebinar.ppt
Or direct link to download: http://portal.hud.gov/huddoc/psewebinar.ppt