I BF Harmony in mine all the time.... one one side, i feed like in the video, and can walk around, still shopping etc...

If I'm feeding on the "wrong" side for the carrier, I just sit down to do it! I put the side closest to me down ( off my shoulder) and put her in the "outer side" (same as the "proper" side) and pull the strap over us both. Since I'm sitting down, I dont need to put the other side up anyway.

I have used my for months, for hours at a time, and never re-threaded my straps. I couldn't be bothered!!!