Experts are not just born. In this real world no one is expert in all fields. He/She may be expert in one area but fails in other. One  sunny day I just walking on road. I felt so tired and felt thirst. All of sudden I found one boy selling soda and fruits. I went to near his shop and order on fresh lime. There are few crowd around there. Boy spin soda and glass flies in air. I was thrilled by all his doing. He does everything in almost speed and perfect fills. Notably taste is too good. He  is a Expert in preparing juice.  When you clearly look at it because he do all his routine activities with same action and passion. So he become expert in it. To become an expert first think u need practice and have a passion in it.