as mentioned, float is important, just miles and getting used to pedals and spinning. Pedal too slow and there is more pressure for the same work; faster spinning spreads the pressure over more pedal strokes. I adjust cleats to shoes by putting my bike on an indoor trainer, put the cleats on the shoes and clip in. Loosen the cleats from the shoe, climb on hte bike and put the shoes on and spin. Once things look and feel "normal." I either beg for help to tighten them up or carefully take my feet out of the shoes and climb off, and tighten the cleats.