When doing those types of lock I prefer using my foot to pull on the cable and having both hands at the lock. A post in hindsight may have been more practicle or a chair leg but gee II just love the ,anlyness of pulling things apart with your feet....
The problem is that the first dial (from left to right in the foto) is very easy to turn when i pull, but the other ones are almost impossible! They are too hard!
turn the dial that is farthest away from the opening end until it goes loose then do the one next to it.
Personally I find its the one closest to the opening end first on these type. The hard to turn one is the one your after. ease a little on the presure if your finsing it hard to turn. At each number give the ial a little wiggle, it should be obvious when its at corect number lot easier to turrn near it but when you get it, it jsut screams "you got me, you got me" it will have alot of freedom When turning, and in cheeper ones alot of wiggling freedom from side to side.