Do not get caught up in pleasures of the flesh. You must crucify your flesh and conquer it in order to make sure you are not letting certain desires consume your life. Deny your flesh and follow God; make the right choices and live by your faith in him. You will find yourself much happier.
A great personal development tip that everyone would do well to abide by is to justify your beliefs. You are only kidding yourself if you don't truly have faith in the things in and it can hinder your personal growth a great deal. Be honest with yourself about what you believe in.
Do not just sit on faith and not use it. Keep your faith alive through works for Christ. It is important that your faith does not just sit there and collect dust. Your living faith becomes effective through true love. Put your faith into action, and see where that takes you!
Sometimes finding a faith to devote oneself to is a great self-help idea. During hard times we tend to dwell on what is troubling us and lose sight of the bigger picture. A religious faith helps one focus on that bigger picture while altering the focus from hardship to a higher power.
So as you can see, personal development is not anywhere near as complicated as it appears. You need to do research (not least upon your inner self) and then you need to work based on your findings. The effort is worth it in the end. With the above tips in mind, you should be smarter when it comes to developing as a person.