Step back and become an observer-
In order to asses situations critically you must make yourself as objective as possible. By separating yourself form the issue at hand you can weigh all of your available options and make a better decision.
Read the Newspaper!
If there is one ritual that you can get into to make you a better critical thinker it is reading either your local or national newspaper.
By doing this you will subconsciously start to analyze the arguments of certain viewpoints. This in turn will allow you to see the faults in your own reasoning and allow you to reinforce or refute your own viewpoints.
Listen-
Instead of being the one to talk all of the time, take a moment to listen; I mean really listen to what someone is saying. Without taking time to listen you may not have your facts straight from the beginning and no amount of critical thinking can right this error.
Be Critical!!!
Stop taking everything at face value and look for the motives. What makes someone do the things they do? Why did he/she just say that? What does this really mean?
By continually asking yourself questions and analyzing situations you will become a better critical thinker.