I have tamed many, many kitties with the “total immersion” method. So much so that I’ve typed this out many times for people;
Have some insanely good food. A few days worth of lunchmeat won’t kill her and there’s nothing like sliced chicken or turkey for this.
Once or twice a day, pull her(him) out and sit down in an easy chair, one with enclosed back and arms, let her “escape” to the kind of tent you’ll make with your back and the back of the chair by sitting a few inches forward and leaning back, and let her eat the lunchmeat out of your hand. Once she’s eaten a little, pet her. (Don’t worry about your fingers. They will not let go of the meat to bite you, though they may freeze and growl)
Keep her there, eating meat from your hand and gently petting her until she purrs. She will purr, even if it’s just for a second, as stress relief. First time might take a half hour or so. At that point, put her back.
From her point of view, the worst happened. The Monster “ate” her. And … it wasn’t so bad. It was warm and there was food and gentle touching. As soon as she started to relax a little, it was done. She’ll sit there and process that and decide she could have done with more chicken.
Next time you “eat” her, she won’t be anywhere near as scared to start with, she’ll relax sooner, eat more and purr louder. In one or 2 sessions, she’ll be purring as soon as you’re in the chair. At that point, she’ll figure out that gentle scritches and stroking is pretty ok too.
Progression is quick and the cats end up very, very friendly. As I typed this, one that I tamed this way jumped into my lap and shoved her face at me to “whisker kiss” (rub her whiskers and side of her mouth against my face) me with some force, draped herself over my shoulders for a minute and then went to investigate something.
When I first caught her, she hissed, bit, scratched, fought, screamed and released her anal glands on me. She wasn’t just a little feral, she was out and out wild.
She isn’t the only kitten I ever tamed this way. They all come out like this.