I just did this a few days ago.
I had a reputable archery shop install the QAD pro LD rest and I was set to go in about 15 minutes. They set it up and got me centershot adjusted and then had me shoot a few arrows to watch and see if the rest was dropping correctly. Then they fixed the cord at the right spot and finished.
I added at least another +10 yards of confidence with this rest, meaning, my 30yd groups are now like my 20 yard groups were. 40 yd groups like the 30 yd were.
