Yup - practicing with the guitar on your left leg (if you're right-handed) is the better way as the fretboard ends up at about eye level, making it easier to play.

What I do to get around the sitting/standing problem is practice sitting down but with a strap on the guitar, and the guitar hanging just above my leg. That way, it's in the same position wheteher I sit or stand, and the problem is over.... :cool: