Without a C&R net I would not attempt to net the native, there is no careful way to do that. Try to work the fish close so you can get the leader and unhook the fish or cut the leader. If you had the fish with a plug or other harware try to grab the top of the plug and unhook the fish that way or just break him off. Fish will shake the hardware out in no time at all, plugs are cheep, natives are irreplaceable.