[b-man]

I don’t install the bumpers with the car up on jack stands, it’s so much easier with the car sitting with its wheels on the ground.

Use your floor jack with an old towel folded up on the jack pad to protect the bumper. Leave the brackets on the bumper.

Just recently installed both bumpers by myself on a ‘67 here, same on my ‘64s, solo operation with a common floor jack. Just balance it on the jack. If you have a paint job to worry about then get a helper and protect the paint with a few layers of blue painters tape.

If you have a helper so much the better but I always prefer to work alone unless absolutely necessary.