@NatureMC I wish I had good tricks; but if I had effective one, Charlotte would trust me after 2 months (and she doesn't let me pet her).
I try to just be around when I feed them, calm, play with a stick or whatever caught their attention. Throw them cat food and see daily how they come closer. Until at one moment, they make the move and come to contact. It's a magic moment.

I try to not "catch them", or enclose them into something or a stressful situation. It requires patience and time.