It's very easy to train a rat to be close to you.In the beginning, put the rat's nest in a quieter room, preferably by yourself. People go in and put some food and cold boiled water for it, and let it eat quietly by itself.

After about two or three days, you can put some white mice food directly on your hands and feed them. The white mouse will come to eat directly, and then try to gently lift the hand holding the food to touch the white mouse's body.