Lovely, wise advice here.
Like the Buddha's advice on Practice on playing the loot ... strings not too lose, not too tight, to make the harmonious sound.
Then just play, don't think about playing while playing.
Remember that the result of this "Just Sitting" is sitting vibrantly at the center of all the world, with nothing more to attain and no other goal besides sitting. Not one other place to be or thing to do in the world during that time of sitting (no matter what in life awaits after). It is not sitting like a bump on a log, twiddling our thumbs or waiting for something to happen. Nor is it analyzing why we are sitting there, comparing our sitting to other sittings or other activities, and the like. Nor is it worry about whether thoughts are present or not present (even as we let thoughts go, don't grab on), pondering whether one is sitting right or not (if you analyze that, you are doing it wrong!
), measuring the experience. Just sitting should be beyond all human measure.
Just Sit, letting all else fade from concern.
Gassho, J
SatTodayLAH