As someone who's not got much in the way of options with bass instruction in my area as far as I can tell.. I've used online lessons, books, and DVD's for a lot of my learning and well.. here's how it typically goes. First few lessons are monotonously easy.. like you can't help but roll your eyes if you're advanced beyond the lesson. But they give you the bit with one tempo, show you what notes to play, how to hit the strings etc etc. Then they show off a bit at speed or you come to a lesson where the backing track is set to one speed and the exercise is too fast for you to really pick up on or execute, and you're expected to figure out how to slow it down and build yourself up to it on your own. So okay.. I'm going to spend the next week learning this line I'm probably never actually going to use, and figure out how to play it to a metronome click instead of your provided backing track. Am I wrong in thinking that people who pursue musical education in grade school get a bit more detailed instruction with instructors that run through their practice routines with them, and will slow down to the student's pace to show them how to build the ability up to tempo? I.E. Assisted guidance an hour a day 5 days a week, vs "Hey here's this bass line/technique at speed.. here's my 5-15 minute video talking more than I'm providing examples.. if you can't do it figure out the drills to do so on your own. Please subscribe, see you next week." I'd love to have an instructor who would run practice drills with me at my pace and give me a routine to run until the following week in order to build up speed in whatever technique or passage I'm trying to learn. At least certain online lessons offer guitar pro documents that let you slow down or speed up at will.. but even then you're lacking immediate criticism and help correcting bad habits.