I'm about 2 years in to learning upright coming from electric bass. This is the hardest thing I have ever done. I have a good instrument that is setup well, I have some good teachers around, I have the Ray Brown and Simandl books plus plenty of great videos on YouTube. I make use of an app called iReal Pro that plays tunes back to me without bass. But geez Louise, learning this instrument is emotionally and physically exhausting. It's rewarding when it sounds good (in brief spurts) and I am already playing some tunes on upright with my band. But can someone please agree with me that yes, this is a VERY, VERY DIFFICULT instrument to learn?