I agree Vanity. Not every attribute or ability you earn is something you get when you're born, by birth. In this case this is called 'psychic development'. Basically, even with a gift you will not be fully developed in a spiritual and psychic way. Even as a gifted and psychic person you will need to practice and develop your psychic abilities. Sometimes people are 'more gifted' and sometimes they're 'less gifted', but yet, people from both of the categories must take care and practice in order to psychic develop themselves and actually get somewhere using their psychic abilities and gifts they got.
Mostly the misunderstanding occurs because people think that the term ability means something which is a gift or a skill you got by birth, while you can earn these skills and get this ability developed and found within yourself by the training, even if one has less potential than another. The word ability as very misunderstood. So this is why I agree with Vanity.
As all arts and practices, this can be achieved by training as well. Doing the actions described upon are all achieved by training, either by 'gifted' people who might not even be aware of the gifts they have, and either by people who need to practice and train themselves in order to develop their skills a bit more hardly.