Yes of course I've doubted.  The reason is simple I am human. 

Some days, but in the end teh owier of positive thinking, persistance and patience will always win

Everyday there is something I make a decision on that brings doubt but at the end of the day it all works out.  I just hate to be wrong.....

We all doubt ourselves at one time or another, William. It's just human nature to do so.

Good morning William. I sure have doubted myself. When fear about anything shows up, doubt creeps in, fortunately it doesn't last long.

 Good morning William. We all have doubts. It's all about overcoming our doubts and fears which is important

Heck no :) - I think unless someone is overly confident, everyone doubts themselves at one time or another... Self-doubt often comes from lack of confidence, fear of failure, lack of knowledge, feeling that we'll look stupid, or someone will mock us, being overly cautious...  Being knowledgeable and confident in your field helps, practicing also helps a great deal.  Lastly having a vision and taking the right steps to achieve it will go a long way towards clearing self doubt.  Minor setbacks should be treated as adjustments we need to make in our paths.

All the time.

Never!

Always thinking of solutions