Most people that know me think that I am a very paranoid person. I never let anyone pass behind me without watching them or turning toward them. I only sit with my back against the wall in restaurants and such. The training you mentioned is similar to what we do in out dojang. I also like to put on a blindfold and have people randomely attack, thus hitting you while you don't "see it coming."
A few tips from the king of paranoia:
lock all doors asap in and out of the car/house
have keys in-hand before heading out to car
keep hands out of pockets when in public
don't be afraid to speak to anyone around you to feel them out
Don't walk closely around corners
park in the lighted areas
have a key or pen in-hand to use as a kubaton
Train to go from freindly conversation to full contact if needed
When attacked at random in the dojang, be sure that the attacker truly follows through with his reactions to whatever you do to defend yourself, thus making it realistic. Basically make this training as real as possible, not just attacking and then saying "well I would have punched you in the throat..." I think you know what I mean.
Just some humble advice from the top of my head. Just look, listen, feel and the rest will come.