When you get your cast net, learn how to catch some bait. That bird is hungry. It will eat from your hand in a day or two.
Pics or it didn't happen...
DO NOT TRY TO HANDFEED A BLUE HERON!!!!!
Awe come on, anything goes around here if pics are involved.
Seriously though, the OP needs to practice on some bait. He'll most likely only get one shot at the bird with the net and some bait will get that bird a lot closer.