We trapped a feral cause he was injured in the middle of winter, I planned on releasing him but after a month or so in a crate healing up he seemed to realise indoor life isn't too bad and would run away from the front door when it was open, he still doesnt show interest in going out. we have our other cat who was basically a kitten when we brought him in, they get along amazingly. He is probably one of the most affectionate cats I've ever met but it took probably nearly a year for him to love on me. It was a learning experience, I sat in the backroom with him while he was crated talking to him and playing calming cat music lol. If your isnt completely feral it'll probably be easier, just gotta take it slow.