A number of years ago I was signed up to do a spring dive on the Munson wreck near Kingston, Ontario, a dive I'd done before and really liked. My buddy went first, pulled himself along the granny line to the bow and the mooring buoy. I jumped in, and had a hard time with a surface current that put me out of breath. I decided that this was not for me, and aborted the dive. This decision let the new diver behind me, who appeared apprehensive about the dive to bail, too. My buddy said he'd hook up with someone else on the wreck, then went down the mooring line.
While sitting on the boat I made another three decisions. One, get a drysuit. Two, get fit. Three, be self-sufficient.
Later, my buddy, who had teamed up with someone else, said the surface current was snotty, viz was the pits and the thermocline was shallower than usual.
I still feel good about those four decisions. And the second dive of the day on the wreck of the Comet, was just beautiful.