I can't speak to leader but I did 7 rolls of cdl and 2 rolls of D&G. I string out lateral somewhat tight from top to bottom, then go back to top and tension the end tree. From there I go down and mark 5-7 trees while holding the lateral tight. When I get to where I want to stop I simply drop the line and go back and cut the drops in from where I dropped the line. This gives me just enough slack to be able to dunk the ends in my thermos on my tool belt. It may sound complicated but it seems to work well for me. I had 250ish drops on 9 runs that I did. If I was more than this amount I might have made a tubing tool but havnt seen a need yet.
FYI- cdl tubing has been great to work with, D&G much harder and to flexible, I thing it would make good drops though.