I second he excersing notion. Practice and do excersises to learn, get a good handle and even build it up.
As far as he entity goes. Clearly you know who/what it is. Research it, Know who/what you are dealing with clearly (history, any lore from any religions about it), then make an educated choice in finding a banishing method that you feel that would work (based upond what you learned about it).
Good luck and congratulations on the awakening.