The most important thing about motivation is goal setting. You should always have a goal.
Motivation is like food for the brain. You cannot get enough in one sitting. It needs continual and regular top ups.
Do not fear lack of knowledge, talent or skill. Seek motivation and the others will come.
When you face your fear, most of the time you will discover that it was not really such a big threat after all. We all need some form of deeply rooted, powerful motivation -- it empowers us to overcome obstacles so we can live our dreams.
The moment avoiding failure becomes your motivation, you're down the path of inactivity. You stumble only if you're moving.
Ability is what you're capable of doing. Motivation determines what you do. Attitude determines how well you do it.