It’s easy to take the net for granted. I know many seasoned fly-fishermen that too often leave it at home, myself included. There is one really good reason to use a net: It is usually safer for the fish enabling you to play it less, before bringing it to net (Unless you are very experienced and smooth in your handling of the fish). This allows the fish to have minimal lactic acid build up in its muscles which gives it a better chance of surviving upon release.
Note: Also remember to wet your hands before touching a trout or your hands will remove the mucus membrane on the trout. This membrane protects the trout from fungal or bacterial infections.
There really is only one key to netting a fish – Net it from the front!
Oh yeah and don’t miss.