Here is a method I use to good effect:
1) Take a detailed look at the pros and cons of what you want to change. This is sometimes sufficient by itself - more than once I have realized I simply get nothing out what I'm doing, and the desire goes away by itself.
2) Find a substitution for those pros.
Alternatively, think about an example of when you decided to do something and then actually did it, and try to port the methods over. Personal example: I recently had a low-grade freakout over deciding to do a particular paperwork process that is famously slow and awful, and brings up many deeply negative feelings for me. Then I was cleaning my dutch oven, and reflected on getting a warranty replacement actually took about three months and several phone calls, which is frustrating but perfectly manageable. This gives me confidence that monitoring a slow administrative process is achievable, and I am more likely to complete it now.
I've recently been extracting extraordinary value from the Jocko Podcast.
Jocko Willink is a retired Navy SEAL commander, jiu-jitsu black belt, management consultant and, in my opinion, master rationalist. His podcast typically consists of detailed analysis of some book on military history or strategy followed by a hands-on Q&A session. Last week's episode (#38) was particularly good and if you want to just dive in, I would start there.
As a sales pitch, I'll briefly describe some of his recurring talking points:
The Q&A sessions, in which he answers questions asked by his fans on Twitter, tend to be very valuable. It's one thing to read the bullet points above, nod your head and say, "That sounds good." It's another to have Jocko walk through the tactical implementation of this ideas in a wide variety of daily situations, ranging from parenting difficulties to office misunderstandings.
For a taste of Jocko, maybe start with his appearance on the Tim Ferriss podcast or the Sam Harris podcast.