I do not use the Lee Collett Neck Dies, but that doesn't matter. Lee usually puts "set-up" instructions in with their dies.
I usually buy Full Length Dies for all my rifles. When I decide to only neck size using these FL dies this is how I do it. I know from experience that in order to FL size my cases, I run the die down until it meets the shell holder (with the press ram in the up position and the press handle all the way down) and then about another 1/2 turn down until I feel that "camming" over effect. So in order to only neck size you have to run the die back up.
First I lube my case up, both the inside of the neck and the body. I wipe any lube off the shoulder so as not to get dimples there. Then I take a Bic lighter and smoke the case from the bottom of the shoulder up to the top of the neck.
Then I start running the case up into the die. I usually start out with the die too far out and have to run it down to the case to start the process. I usually try for about 3/4 of the neck resized. You can see your progress as the die will clean the smute off the case neck and shoulder (if you go to far) as it goes in and gets resized. I turn the die down until I get it where I want it and then lock it in place. I clean the case off and try it in my rifle to make sure it chambers acceptably. Hope this makes sense and helps you out. JohnnyK.
"The pleasure you get from life is equal to the attitude you put into it."