Auto-Inception - Changing Ones Beliefs.

Maybe life never proves a deep belief to be wrong but LIFE PROVES A DEEPER AND MORE BEAUTIFUL BELIEF TO BE RIGHT !!!
I don't know if I can give you any help for inception, I don't know if I know anything about it...
But about what you said I can suggest some things...
You said you know which belief you want to change, it's great. Now, choose which belief you want to have instead.
You realized you were "determined" by this belief, so now you can choose which belief you want to keep...
If it's difficult to choose a new belief, look at the one you don't want any more and put it upside-down : more often the "right" belief will appear.
I think things we need are very close around us because there are deeply connected with the things we have.
So, once you are sure about the belief you want, a belief which would make you smile in your life, decide  now you are someone who sees life this way and life is greater.
And then ? You will probably have the impression it doesn't work... Because the old belief is still around you, it's a part of what made you as you are.
It's the first sign it's working in fact : thanks to this old belief (and everything else) you came to change it and to choose an other and better belief.
It would rather suggest you don't believe the new one strongly enough.
So now, what you have to do is believing you have changed, you are believing something new and this is real. Try to see everything around you with the new way of seeing life : it will show you life can proves a new belief to be right. Even the simplest things.
And of course sometimes it won't work again. So, when starting to feel everything you did to change didn't bring you anything, when starting to feel bad catch every single little proof you observed thanks to the new belief.
I do live my life this way, I can say sometimes it's difficult to keep on believing I have changed some of my beliefs. It's even more difficult to accept the old beliefs and behaviours are still there. But life is not a line, it's much more. So I decided if I still use the old beliefs or behaviours (unconsciously) it has to have good consequences. It helps me to believe stronger in the new beliefs.
I forgive myself, which can be really difficult, and look for what made me using the old belief. Then I look at it upside-down and create a greater new belief. And so on.
Don't worry about time. First of all, what is "time" ? Just something created by human being. It's quite useful so we  deeply depend of time. We may think we couldn't see life without time, we couldn't explain it. But sometimes we should give up "time" to explain life and to live it.
What I described can take years, well it does take years, a whole life. But life without playing is boring.
I would hop this help.
I'm sure you can do it. Everyone can do it if he wants to.