Tips for actively practicing thoughts

As I am growing in the model I am realizing that is not enough to write out my feelings in the model, but I actively have to dress rehearse being that person. Any good tips for bringing that person to life? I try to meditate on my new thoughts and run them over in my head. I am wondering if some of the resistance I am experiencing is because my brain still doesn’t want to accept all things as neutral so even though I am focusing on the thought, there is some underlying judgement?