If you have some time, you can train the fish to eat out of your hand. I've done this with all of my larger fish (tangs, butterflies, etc.) and I can grab them really easily when they are expecting food. They also let me "pet" them now.
Going after fish at night works well too.
They are bold, I started feeding my fish in a fish trap. He would go in there and feed. Well all the tangs did before him, But eventually he did and i could pull him. It took a few days before i even tried to catch him.
Also some tangs would hand feed. When i wanted to catch them i would hand feed and have a net ready in the other.