The worst that can happen, although unlikely without extreme aggravating circumstances, is up to 6 months jail on the DUI (assuming it is only your first within the past 10 years) and up to 6 months jail on the Hit & Run charge. This is also assuming you are convicted of both, or any, of the offenses.
You would be on the hook for restitution, lose your license for several months and face terms and conditions of probation including a DUI program, MADD meeting, et al.
Representing yourself appears to have worked out great so far as you have lost your license via DMV, were arrested, and likely need to defense against a refusal allegation/enhancement.
Stop being stubborn and hire yourself the best, locally experienced, criminal defense attorney you can afford ASAP.
Hiring a quality, locally experienced criminal defense attorney to represent your interests and ensure you get the best possible outcome given the facts of your case should be (key words) a no brainer!
Even on a first time DUI (and assuming no one other than maybe yourself was injured) you are facing a 9 month DUI program, 5 years probation, up to 180 days in jail, et al.
Hiring a lawyer would also alleviate the need for you to show up at court (assuming the case is a misdemeanor only)...
Stop admitting guilt to the alleged victim of the property damage and on public forums such as avvo.com, setup your DMV APS hearing within 10 days of your arrest, and hire yourself the best (locally experienced) criminal defense attorney you can afford.
The law requires at least 96 hours custody for 2nd time DUIs within 10 years. The property damage and high BAC aren't going to help.
If only it were that easy...
If your friend is a CA attorney, then they should resign as an attorney immediately. If they are not a licensed, locally experienced criminal defense attorney, then you should hire someone who is.