Step 2: Do the research
Certifications: Familiarize yourself with the various bike fit certifications. Specialized BodyGeometry Fit, F.I.S.T. Fit, Retül Fit and Serotta Fit are some of the most prominent. Use each database of certified fitters to find someone in your area, or an area you are willing to travel to (often an overlooked option). The certifications will ensure a level of quality control from your fitter, but the person is ultimately most important.
Fit technology: Generally, better fitters invest in better technology to enhance their fit skills. A basic understanding of the various fit technology options allows you to make an educated choice about which is right for you and draw greater benefit from the process.
Triathlon knowledge: Even though all fit curricula teach triathlon fit, make sure your potential fitter understands triathlon bikes and triathletes.
Fitter reputation: Use local or regional tri groups and their forums to get feedback on fitters they like and why.