Clamping down all notes of a chord on the neck simultaneously
My teacher has mentioned that I need to be able to clamp down all notes of a chord at the same time and not hesitate between chord changes. I don't disagree with him, but how long would you say it took you to get to the point where you could do this without thinking? (I'm about 8-9 mos. in and can't do it yet.) And I can't imagine how I would "clamp" a barre chord.