Step 4: Where to from here?
If this is going to be reasonably permanent swing, you can miss out the cambium saver and just set the rope over the branch. Then make a bowline in one end of the rope, slip the other end of the rope through, and pull it up into the tree. Now you will HAVE to climb the tree if you want to get the rope out again.
Because the rope is looped over the branch, it will re-set itself as the branch grows - no etiolation.
A rope through a cambium saver is the ideal anchor for climbing the tree. The friction of a rope over a branch can do permanent damage to the bark
Attach a swing to both ends of the rope, and do whatever comes to mind.