Other than that, try things with courage and reflect on how it went. Read a lot - books, articles, discussion groups etc. pp. Ask questions on forums like this one.
Practice, practice, practice. And be patient. You've done the first steps already, like reading head first and joining JavaRanch. You will do well!
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus