Lots of instruments are initially 'easy' in that if you have a rudimentary sense of rhythm and melody you can probably get a tune out of it and think 'Hey, this is a piece of piss'. But it's a long way from picking out 'chopsticks' on a piano to playing say, classical music. Similarly the bass is as easy or as difficult as you make it - like you can be Sid (most single cell organisms upwards could probably manage 'Sid') or you can be Stanley Clarke or Geddy Lee or something. Eventually.