That is what I keep reminding myself whenever I read some books. I grabbed this idea from some kungfu movie and it makes sense : when you forget what you read, it becomes your knowledge.
Another reason is that the knowledge you gain will make you realize the gap between what you can do now and what you want to do. Hence you will be cautious, paranoid, careful and eventually you will do nothing at all
Sometimes, keep it simple will get things going. Planning too much (much is the keyword) will just make things slow (or completely stop it).