Try using two pcs of glass the same height of your tank so he doesn't jump over. If you can, place one pc. in the tank so that one side is against the tank, and the other side is open Leave it for awhile untill the fish get accustomed to it. Eventually your angel will swim between the glass and tank, as he does quickly block the other end with the other pc of glass. This has worked for me several times,
be patient. Caution with a net, Angels have small barbs around gills and can get tangled up in your net.
Good fishing.

hmm how would you recommend to catch a golden angel that is always hide and does not come out and feed but still very fat and healthy. I want to catch him to trade for a flames angel because i hate seeing him once or twice per day.

I had to catch a flame angle out of my reef, took me about 1 week to get the lil guy. I tried everything, I ended up using eggcrate and blocking off half the tank then kept on adding pieces till i got him in a small blocked off section and then just used a net :)