As mentioned, most respectable companies require "proof" that you "know" what your doing. This usually means some type of diploma/degree. Ive been studying computer science for almost 7 years now and havent started the career searching yet.
As with everything in life, the amount of effort you put in to something is proportional to how much it will pay off (or your success). If you read/study for a few months then it will probably be difficult to impress an employer, especially in todays increasingly competitive and difficult market. Then again there are always people who get breaks.
(Note I am not trying to be discouraging, if you think so).