Being open minded isn't really that difficult.
When you are growing up you began to collect and are taught different beliefs that you take with you thru life, and you believe that what you believe is the right way of looking at things (sometimes the only way). These cultural beliefs that you carry with you is called a PARADIGM. A paradigm is simply a collection of cultural beliefs.
The first step of becoming truly open minded is to recognize that you have a paradigm, and to understand that everything you THINK you know or everything you believe may not be the only way to look at something. Be willing to accept others opinions and views for different situations.
A wise man once said "Your mind is like a parachute, and if you keep it open you will land safely in any situation. But if you continue to keep it close, you will fall quickly and cause great harm to yourself."
Look up Bob Proctor "Paradigms" on youtube. It will really change your life. It changed mines.