As I mentioned, if you can get it over the top just once, you can stand on the ground and throw loops in the string and be pretty darn accurate as to which branches the loops go over. You can even throw the loop backwards to get it back off the branch if you screw up. It works well. I have a pretty good arm, still. So I can get the loops to go up about 38' from the ground. After that, the weight of the string just keeps the loops from going any further.
So, yes, I am saying I can basically walk Christmas lights up on a 40' tree from the ground once I get one strand over the top. THAT, is the hard part... getting one over the top.