Done a number of pull-pulls, its a bit intimidating the first time, and it may take a couple tries to get it right. I prefer to start on the rudder end, getting the cables on the horn or coupler and crimped there first. One, make sure you have a plenty long piece of wire, too short and you'll be cussing.. Run the wire thru the crimp tube, then thru the horn or coupler.. bring it back around and back into the tube from the 'top', so you have both wires coming out the bottom. Then take the short end and loop it back thru the tube again. Holding the tube in one hand and long part of wire in other, pull the wire taunt and slide the tube down toward the horn until its about an inch or so from where the wire is looped thru the horn. (Or you may be using a turnbuckle type item attached to the horn, either way do same thing). When its where you want it, the wire in the crimp tube is nice and tight, crimp it nice and hard. Trim any excess. Do the next side. Run the cables to the servo.

At this point you want something on the servo arm such as Dubro threaded couplers so you can tighten the wire. Then I normally turn my radio on so the servo stays in neutral. Tape the rudder so it stays straight or have a friend hold it, and do the same procedure as with the rudder connections. Try to get it nice & tight before crimping, not heave-ho'ing on it, just good firm pressure. Once done.. start adjusting the couplers to tighten the wire. A little on side and then the other. When its complete, you should be able to pluck the wire and get a dull bass sound, akin to a guitar out of tune. Don't overtighten! Should be just enough to firmly hold the rudder in position without slop.

First time it took me maybe 3 tries to get it right. Nowadays its no big deal, well... can still be a bit of pain sometimes.. but its my preferred setup if I can make it fit the plane. Google pull-pull, lots o' good pics and such..