You just have to suck it up and do it. I took mine on a whim. I was watching TV/dicking around on the internet when I saw something about the LSAT or law school or something. Broke out the timer and some pencils and off I went. No time like the present.
You have plenty of time to get your score up to t14 level. I'm in a similar situation (159 diag) but I'm taking the June test. I've decided against taking a course, but they are definitely helpful for some people. You'll have to make that decision yourself. Good luck.