I think you should definitely go through recruitment. I did and I was not successful, but then AOII re-colonized at my school and I signed up for their recruitment. Colony recruitment, in my opinion, is more competitive than Panhellenic formal recruitment, because there can be hundreds of women trying for just one house. However, do not let that intimidate you! The best thing is to be yourself, show up looking nice, and practice your conversation skills! This goes for formal rush and colony.
Honestly, the way you present yourself is extremely important. I learned a lot from my past experience and am now I proud colony member of AOII