My first option is a base ball bat- yet that could lead to a short time in jail, which would not be the best thing, so there are things you can do, or at least consider, one would be to take some self defense classes- that way in the event of something happening you have away to protect yourself, other things are to make sure you someone is either with you or know where you will be.
As for techniques- Just notice how you are feeling right now, and what ever name you might call that feeling, just let it be, and just notice the sensations, the warmth or coolness, the weight or lightness, does it have a shape a colour? a sound and just notice noticing- and just be with that, nothing more nothing less, what do you and can you notice on the outside- what are you seeing hearing? and just be aware of being aware- and now if you was feeling strong calm and confident right here and right now, whats happening inside for you to know that you are feeling strong calm confident right here right now? and if you was to increase that feeling by just 1 half of percent how would that then feel? now while your in this/that state (press your index finger and thumb together and while your doing that at the same time say in a very strong inner voice inside your head (Strong Now!!) now repeat this this 7-11 times and each time increase that feeling of being strong calm confident in this/that time in the here and now- now go in to a time in the future several years from now, and while your in that time, turn around and look back from that time to this time, and press your finger and thumb together, and say Strong now, in that strong voice, and while your in that strong place in that time in the future walk back from there in to the now minute by minute, hour by hour day by day, week by week, month by month tear by year, getting stronger and stronger until your reach the here and the now, then turn around and walk back to the future and again taking this that state of being strong, all the way back there in that future time, and again turn back and do this several times each time making it faster and faster stronger and stronger- then stop- go for a drink of water- and just notice noticing- and when you need a boost press your finger and thumb together- and just notice and just increase the feelings of strong just by one half of a percent each time.