First thing to know about self protection is also one of the easiest things to start practicing. "Self Presentation" you will discourage many would be attackers by presenting your self as a difficult target. This is easier for some rather than others. For example, I am a 6ft 2in. and 200 LBS man, right away I am not an easy target.
None the less there are still a few things you can do to tip the scales if you are a 100 lbs 5ft 2in woman. For one, before you leave the house, get all of your stuff in gear. Don't even leave your front door unless you have everything you need, organized, and the right keys in your hand. Criminals like unsuspecting people cause they don't get I.Ded by them, if you are fumbling with your keys and or your purse, or brief case, you will be labeled as an unsuspecting person. If you often go to your car when it is dark out, or in a dark place such as an indoor parking garage, you might even want to get a pocket flashlight and start shining it around, even if you don't know what your looking for, you can present yourself as if you do. Keep your chin up, shoulders back and at least look like you are aware of your surroundings.
Another thing is your attire, people know that you are not going to run very far or fast in heels, but on the other hand the heeled shoes can be used as a weapon, when you choose your clothing you should have things like this in mind, can your run or defend yourself in this?
That is it for part one guys. Part two will be "situational awareness"