I'm similarly skeptical of chiropractic. My understanding is that traditional chiropractic technique MAY relieve lower back pain. For other ailments, there's no evidence that it's better than a placebo. And spinal manipulation can be risky. Unfortunately, there's a lot of confusion and a lack of consistency around what chiropractors do, since many of them do a lot with evidence based physical therapy in additional to spinal manipulation. When you come right down to it, the core concept underlying chiropractic is pseudoscientific nonsense. I sure understand why people go to chiropractors, given how difficult and frustrating it can be to navigate PT and joint treatment in the mainstream health industry (been there, done that). And I wouldn't suggest for a minute that all chiropractors are frauds and quacks, plenty of them are responsible. But it's a minefield, and one that I would be pretty hesitant to navigate if I had a back that was already marginal. If a chiropractor says my hips are "misaligned," I would want to know exactly what that's supposed to mean.
I definitely agree with ridethecliche on getting a referral from your PCP. Your PCP's primary jobs are general preventative care and coordination of care. Coordination means helping you get the referrals and appointments you need with specialists.