Sit with the cat and watch it while it's eating, this will get it used to you. Since I smell of cat anyway, I just sit for a minute and slowly creep in... once you pet it, it's game over
It still took me a month or so to get Norl in though but it was warm.
Sam... only took about a week to con him in to getting inside to eat but he was warm for the winter
Zif... I walked around the parking lot of walmart for an hour before he got wind of the snacks... it took a bit of petting and snacks... then I grabbed him by the scruff and carried him to my truck.. he hid for a day inside the house before he came out for food, boy, did he enjoy that!
He's getting pretty normal now.
So... shouldn't take but a few feedings and they know there's food coming. Just creep up slow and talk to them, pet them, get them to eat inside and to get used to the territory.
http://www.wikihow.com/Communicate-With-Your-Cat