re:locking car doors. Lock when not moving, unlock when moving (if you ars so afraid of the very rare crime (in the UK) of car jacking)- it is not difficult. Being mugged is also rare. Self-defence classe are fine to build confidence but any good instructor will tell you that resorting to it is very much the last resort. Carrying "weapons" is also not a very good idea because, even if you are willing to assault in self-defence an attacker (and many are not or cannot) the chances are he/she will either be better armed or skilled or will take your weapon and beat the shit out of you with it.
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