Step #1 is you have to DECIDE that it's time to change something. It could be an area of your life, like a relationship - a fitness goal, to quit smoking or whatever.
Step #2 is to kick start it with action. I do not care what the change is, it ALWAYS, and I mean ALWAYS starts with an ACTION. Just a mere thought that you'll do something differently won't be enough. You have to actually DO something.
Step #3 is to keep taking that action so that it grows into a MOMENTUM. As you keep going, as you keep pushing, the momentum flywheel will start to spin and will push you further and faster towards where you want to be.
Step #4: is to stay CONSISTENT. After about a week, the initial excitement about what you're doing will slowly subside, and that's when you simply need to stay consistent with it. This is a point where you are ALMOST there, and all you have to do is just keep at it, until it becomes
Step #5: Create a HABIT. Now your ACTION has become a habit. A habit is simply something that you DO as part of your life. Going to the gym becomes a habit. You don't even think about it anymore. Reading for 10 min a day becomes a habit, you don't even think about it anymore. It's just like brushing your teeth - there isn't a lot of will power necessary to brush them every morning.
Step #6: You get the RESULT you want. Now that you've done your action for so long, that action has slowly chipped away and built your new self. Now you became the new version of yourself.