How difficult is it to get an Uber/Lyft after the concert?

Best to go over stairs and request from train station

Second what they all said. We walked around the corner and got 1

Is very easy if you get it before the concert ends

As Paul Masters said, easy, but many do it, so expect delays

Easy, if you have the app and order it way before the concert ends. There's a huge crowd after the show at the pickup point.