dovescot training rollers is as easy as it is hard the mane thing is never leave food in with them .
the first thing is to get them coming off there perches and onto the floor for there food [only feed them weat].
once they are doing this for 3 days start letting them out but only when they are hungry once they are out try to get them in with food do this for about a week leaving them out longer each time.
now the dropping part most people use a landing pole it needs to be about 8ft above your loft and normally they will use this straight away.
the main thing is to keep them hungry so you have got control over them if you loose control you will loose the enjoyment as they will sit all over the roofs. this is only the basics but i hope it helps ;D ;D ;D