You will have to do the 'work' (because it is work) for yourself. Only you can take the fear away from yourself after all is said and done.

Remember that you are a strong multidimensional being and stronger than any supposed evil astral entity.

Of course there are measures, but your mindset is the most imporant one. Anyway some measures for what it's worth:

Try affirmations if they help you. Ask guides to protect or guide you while you are out. Use a Black Tourmaline stone at night if that is your thing (or any other protection stone).

Also you might look at Mr. Buhlman's 'effective mindset' list:

http://www.astralinfo.org/effective-mindset/