Naw, you're OK, Sizzle. The one line you had to climb on tells me you were ascending DdRT (Like the 2:1 setup just above, only probably using a hitch), or SRT. Are you climbing on one line (SRT) or are you climbing on a doubled line while footlocking a single line (traditional DdRT)?
I was climbing a doubled line, DbRT, where both ends of the rope are on the ground and each leg does not move vertically with regards to one another. That's the magic of dual ascenders. Clip them on and go on up.
I didn't really think about that that's not how most tree climbers ascend, but then again I was there to show the footlock, not demo one technique against another.
Footlocking a doubled rope, like how I show in the video, is often easier than footlocking a single rope because you not only have the friction of rope against boots (or bedroom slippers), but the friction of the rope against the rope itself. There's more 'meat' to grab.
Do you just need to practice? Well,.... yea. Regardless of whether I climb DdRT (1% of the time) DbRT 74% of the time) or SRT (25% of the time) my footlocking technique does not differ. SO, should you be trying footlocking a doubled rope? I think you should try all kinds of things to see what works best for you. All I ask is that you climb safe.