I've been "playing" now for 4 months and taking lessons though I realized yesterday that I didn't start at my age (51) to be frustrated, exasperated and not wanting to pick up my bass. I've been through Hal Leonard's book 1 and another beginner's book that I have. I can sight read and have a grasp of the fretboard. I'm stopping my lessons today as they are unproductive, creating the frustration with stuff that is beyond my level and total lack of organization on the part of my teacher (who is an excellent guitarist). We do something in a lesson, he sends me off to practice it which I do then the next week, he's forgotten what he was supposed to bring and we start something else. Where do I go from here?? I searched here and there's some recommendation for Carol Kaye's stuff. I know I need to find another teacher, but I'd prefer to wait on that until I have a more firm grasp of the fretboard and its use in actual music. HELP provide some direction for forward progress please.