Some people are just not mechanically minded. They can have incredible skills in other areas but can't use a wrench if their life depended on it. The wise mechanically challenged take their stuff in to a mechanic. The foolish mechanically challenged try to work on their stuff, and then take it in to a mechanic. Recognizing one's own strengths and one's own weaknesses is true wisdom. Laughing at the wise is the sign of a fool.