How well do these Engineer tips fit your thinking about self-confidence?
Never:  Never use it: 
Try:  Might try it.
Use:  Use it as needed
Tell: Tell it to people who need it

Do you know your most powerful skills?

Do you know how to select the right skill for the job?

Meal check: How many successes have you had since your last meal?

You already have all to brain tools you need.  You want to find the tools that fit the job.

Meal check:  What will you accomplish in the next hour? 

Meal check:  Take the next thing you will do. How will you see that it is done to suit you?

Meal check:  How many times have you thought “I can’t” since you last ate?

Do you use planning to build confidence in your plans?

Can you cut a big job into bite-sized joblets?

Be confident.  Even if you are not, pretend to be.  No one can tell the difference.

Never try to cross a ditch in small jumps.

Self-confidence grows not from what you can do, but what you know you can do

Children focus on what they can’t do.  Adults focus on what they can do.

The secret of confidence is to know your resources.

You never need to fear if you don't want to do anything.

You got to know when to hold and know when to fold.