I wired tied my nodes to paracord similar to Joe, but instead of putting them parallel to the rope, mine were at 90 degrees. This put all the nodes pointing outward.
First I straightened the wire between nodes so that it was flat and all the nodes were pointing the same direction. Then, I laid a wire tie along the side of the node and wrapped a second wire tie around the node and the first wire tie. I wrapped the first wire tie around the paracord and pulled it tight. This held them very well. I tried to slide some on the rope to adjust the spacing and could barely move them.
If you pull the cord tight and measure the spacing, you can get them all pretty even. Ideally you want the cord the same tightness as it will be on your tree. Since my nodes were 3-3.75" spacing, I used 3" spacing.
I thought the nodes may twist a lot, but the weight of the node and the wire held them fairly straight. They would twist a little in the wind, but not enough to be noticeable in the dark.
Rick