Originally Posted by roadiejorge

The "common sense fit" can work for a lot of people because professional fitting or not your body will always tell you when something's wrong, so the best thing is to take that cue and get some help if you feel you can't sort it out on your own. If you're riding a hybrid and just ride around casually with platform pedals then there's often less fit issues, but once you're clipped in there are other factors to consider which is why in a professional fitting makes sense.