Thank you Ralph. We had no instruction from dealership on "Tractor 101". My biggest problem was I could not turn the PTO by hand to line up the splines. It was stuck. But many suggestions from this site saved the day! And your suggestion of the "order" in which to proceed is a great one so maybe I won't be fumbling so much next time.Place the PTO selector in front PTO spot. Then, you can rotate the PTO by hand to get the splines lined up. THEN can pull back collar/push button (depending on type) to push the PTO onto the shaft.
Thanks for being available.