The first thing i want to point out to taking steps towards the goal is dont disregard any knowledge without first seeing its evidence. If it is a conflicting idea to what you have but has more evidence then maybe its time to reasses your beliefs. You should almost never dispose of information because its conflicting to your ideas, from my point of view all information is good information. the more you know better the person you can be.
Secondly and this not only helps you become more rational but also sometimes even more moral but always try look at the mistakes you have made, the irrational actions and analyse why it truely went wrong. Naturally your brain is going to try rationalise it to be rational, you want to avoid this. Step in and use your brain yourself. By doing this not only are you helping your brain by acting more rationally, it encourages active thinking which is always helpful. You will find yourself becoming less annoyed, angry and sad. The reason this is is because when your subconscious rationalises it you will actually change your memory of the situation and how it happened (i have forgotten the term but this was in a study) if you step in before this happens and look truely at what went wrong and why, you will block out any feelings of anger towards this mistake which in your eyes isnt happening but you are just having a shit time. If you can step in and stop this and find the mistake, you can start making steps towards fixing it.Which leads me to my final point of these points, fixing problems and flaws within your personality will in general just make you a more likeable person.
To extend on that point i would like to say you can train your brain to do anything, and i mean nearlly everything physically possible by a human. There was a man i forget his name but it isnt important to the example, anyway he never excelled at maths at school and was always getting semi-mediocre marks across the board. Once he set out to become good at maths he became recognised as one of the greatest mathematical minds. This is just an extrondinary example of the capibilties of the human brain and that nothing about yourself is set in stone.
People say you cant change, i not only say you can but i say you do. As life goes on links in your brain strengthen and weaken changing characteristics in yourself and changing the way you act and what you are good at.
I guess what i want to say is if there is something that needs changing just change it, its easy to say but it is really hard to do. Although through good mental practice you can effectively change anything you want in yourself (anything mentally ofcourse, if you are ugly then your brain cant help sorry).
Now these are just a few points but very large ones, just start by recognising when you make the mistake at the time, correct yourself. keep doing this. Its a little bit like preparing for an exam and wiping out bad habits you have in the subject. practice an exam, and go through it checking your answers. be hard and critical on yourself, punish yourself for making mistake and be sure to keep on trying to recognise where you are doing those dreaded mistakes. Once you got this it gets much easier to fix flaws you might not like in yourself.
You control your brain, you have the key. Use it and take control, become more of an active thinker and you will find yourself learning more, becoming a better person, making better life choices and in general helping yourself more then you would if you let your brain run on autopilot.
Not many pretty picture today its late and im tired, not a smidge of proof reading either
