Thank you so much everyone for the tips and comments! My tractor guy found an easier drive line…the end that attaches to the tractor has a pin instead of a sliding collar. I think someone posted about that. He says it will be much easier.
He is also removing a small rectangular metal shield bolted to the tractor around the attachment point. I never ever approach the PTO with the tractor running, and will need to be very careful but he says he took them off all his equipment. It makes the PTO attachment much easier to get to with my hands.
In addition, he is installing quick connectors to the three point arms. Someone also mentioned these above.
I will take a picture when he is done.
Hopefully, changing implements will be easy enough that I will actually do it!