Hi Al, In looking for a Chiropractor, try to find someone you know and trust that has had good results with similar symptoms to recommend one in your area. You wouldn't shop for a surgeon in the yellow pages, like surgery, Chiropractic is an art. No one technique is likely to be the answer, so I'ld recommend finding someone who has several techniques at their disposal. In addition to the manipulation/adjustment, which is the Chiropractor's unique area of expertise, most Chiropractors incorporate other modalities such as electical muscle stimulation, ultrasound, trigger point therapy, acupuncture, exercise therapy, etc. Find someone who doesn't limit themselves to one tool for the job.
Sciatica as a diagnosis only infers that you have some kind of leg symptoms--pain, numbness, tingling, it doesn't tell you what is causing the symptoms, which you need to know to treat the problem.
How did the pain start? Have you had similar symptoms in the past? One leg or both? How far into the leg, below the knee? Into the foot? What part of the leg--back, side, front, heel, toes, which toes? What aggravates or relieves symptoms? A hands on examination is needed to further confirm the source of symptoms, often several things are contributing and need attention.