when using a loop for the foot when climbing how does one advance the friction hitch with the foot loop hitch. I asssum you have to advance both knots one after the other, is that right?
You can have a prussik cord that isn't attached to your saddle and just use it to step into to make climbing easier. A lot of people starting out do that.
You don't have to use a carabiner in that setup, just use the cord. For footlocking, you have to attach a much longer cord to your saddle as your attachment to the rope, but then you aren't stepping into it either.