Learning them to trap starts when they're y/birds. You go through a few stages but the first one is to make them realise who's the boss. Gone are the days when I stood a couple of yards from the loft shaking the tin & throwing in grub to the back of the loft. I now stand in the doorway and they have to clamber past me to get in, between my legs, over my shoulders, in off me head ;D (lost me hairnet many a time ;D) if they don’t go past me they go without. I do this every time I get them in, in the end they get programmed in that they see me open the doors, walk into the loft and they follow. When they start exercising around the loft and they're looking to land I do the same, open the loft and they're down and in.