Well I wish you good luck at this i have done it with a good sucess rate. I have been told how ever that you are very lucky if 20% survive. I have also found it best to do it at one time . The reason i feel everyone worries about predators is if you go to a game farm the predators know the food will be there every weekend.
If you do this 1 time they will neot become accustomed to a feeding ritual every week. Don't wory about predators worry about the neighbors cat. feral cats do more harm to wildlife than most predators do. you may try going to the pheasants forver website for additional information good luck