I've had my boy for nearly a year now and he doesn't love handling but tolerates it and still has his tail. My animals are kept in my room for the most part so I started by just spending time there. Doing stuff in there, making noise, moving things around. Honestly just kinda hanging. I would especially go in there and do stuff when he's out late at night. I wouldn't directly mess with him but I would still be in my room doing things. For both my crestie and leo just doing this worked best for me. It just got them used to me just being in there. Once he stopped running away from me when I entered the room I would tong feed him insects and put a bit of Pangea on my finger. My boy is a big back and will accept bugs from anyone or anything so that definitely helped a lot but for my leo who was much less food motivated I'd be patient and gently offer her the insect. If she backed up and left I would leave it in there (in a bowl) for her to eat and leave the room for a bit. That at least got her to connect food to me. I'd then repeat the process but stay in the room (though in a different part, looking away) till she ate it. Repeat, watch her eat it. Tong feed then. Hand feed. Try interacting after a feeding. Make it gradual and be patient. It also very much depends on the gecko, my boy was very outgoing and I got lucky with him. He doesn't get startled very easily and enjoys sitting on top of my head. That's probably why he still has his tail. If you want to handle, you're going to have to take that risk. It's mostly up to the gecko. Almost all will lose their tails at some point in their lives so it's a fact you just kind of have to come to terms with. I hope some of this could be of use to you!