IMO, fairly major surgery on one's psyche is an important part of optimizing one's life. You can't change everything all at once, but a whole lot of attitudes and aliefs can be reprogrammed over time.
For this one, gratitude journal is a good recommendation. Also, the same advice as other habit-changing: learn to notice when your feelings don't match your beliefs, and backtrack to the causes. Repeated self-talk (both affirmations and framing reminders) has a pretty strong effect on me, but others report mixed success.
IMO, fairly major surgery on one's psyche is an important part of optimizing one's life.
Just like any major surgery, it's a risk. You might benefit, or you might screw yourself up in appropriately major ways.
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