Too often the only obstacle for reaching our goal is ourselves.
Lack of determination or laziness too often intervenes.
These sites give some tips and words of wisdom on how to face challenges; not just weight loss, but anything anyone would want to achieve in life:
http://www.successconsciousness.com/index_000006.htm
http://www.successconsciousness.com/blog/inner-strength/how-to-increase-willpower/
