I'd suggest tying the steps to a tree and leaving them for a day or two to stretch the ropes out. I started climbing with the WE steps and k/s combo. It took me a few sits to be able to comfortably climb 15' or so, nothing crazy. I can tell you for sure 2 things. It you have issues, it's probably gonna be with the k/s. I found that certain trees in certain conditions are not safe with the k/s, not that any aiders would have been safe, but my experience is only with the k/s. The second is that the fiddle factor with the knots will take longer to get down than climbing itself. In the dark with cold hands and irregular trees was too much. Especially going down with the k/s in the dark, that was sketchy. It's easier to just set a stick and climb and the fiddle factor with the steps wasn't worth the weight to me.
I'd definitely tie one in close to ground level and push the limits of it. The first time I had a step slide was at 12', not cool. It bit the bark too much and the next time I stepped on it, there wasn't enough to grab onto to be 100% stable. But it held enough and I used it for the rest of the hunt, I just wasn't standing on the cross bar. I'm not sure what it would take for the step to be completely unusable if it's tied to the tree and cammed over correctly initially. I still have the k/s but usually just use swaider (the hook) and skip the knaider. Like Flee and others have said, slow is smooth and smooth is safe, and fast.