Being an actress is not hard as long as you are talented and you work hard enough. For you to portray a certain character, you need to fit in their shoes. This includes researching on that particular person. However, there are directors that help you get into your character.
Well it depends If you have the talent or not for it do you go to actin school that may help... If you really want to do it and have not tried out for it yet it all depends on how you act, the methods you do ext.. Hope I helped!:)