Once again, get used to being aware of everyone and everythign around you, noticing little details like people looking at you funny, strange bulges in clothes, the butt of guns, handles of knives in people's pockets, and get good at avoidance. That's what self defense is really about, learnign to see the signs of impending trouble before it happens and avoiding it. Be aware of available weapons and escape routes wherever you are. Physical fightign skills are a tiny part of it and you need a partner to work with. If you get attacked by a group or someone with a weapon, forget unarmed skills, grab a chair, pipe, anything, use a weapon and then get the hell out of there soon as you can. Carry mace or something. Unarmed skills should be a very last resort. And you HAVE to have a partner to get reasonably good. Take soem boxing lessons or something. Little about 95% of situatiosn can be avodied, or defused, or just yellign the police are coming.
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Member of DaJoGen MMA school under Dave Hagen and Team Chaos fight team under Denver Mangiyatan and Chris Toquero, ran out of Zanshin Martial Arts in Salem Oregon: http://www.zanshinarts.org/Home.aspx,