One of the major blocks to becoming an intuitive is trusting their own intuition.  It has been mentioned many many times not only from my mentor but from other well know healers and speakers of spirituality.  Another block that can prevent one from exploring their intuition and reading for others is that they have to be perfect at doing it.  Overcoming the fear of being ridiculed as an intuitive is another. The blocks I mentioned above is a process that one must overcome in their own timing, but one must work on it deligently on a deeper level.  These are just fears, like anything else we have fear of, that just keeps us chained up in our own suffering.  From my own experience, facing your fears with courage opens up more doors and opportunities for you to grow from a place of fear.  You will then realize that they were just fears after all, nothing else.  We have developed and created these fears not only from this life, but from many lifetimes.  The ones that have been from past lives is the hardest and sometimes the longest to overcome.  However, it is all about choice and intentions.  We must willing to have courage to step into the unknown for that is where everything is possible.