It might be a safer bet to go with one of the tutors from the test prep companies...they use their best instructors as tutors and they have guarantees and a pretty big arsenal of materials for you to use. PR even has online lessons you can get access to - I mean, there's a ton of extra stuff on there, and they don't charge extra for it. It's worth a closer look, at least.
The other thing you could do is take a prep course, and then supplement it with a few hours of tutoring. That way you could work through your weaknesses as much as possible before getting a tutor who can really hone in on them with the tutor and maximize your time. Have you already taken the LSAT or studied a lot on your own?