What is the difference between confidence and over confidence?

What is the difference between confidence and over confidence?

 1- Confidence for me means to believe in me and my hard work.

Overconfidence means believing only in me and without hard work everything is just impossible.

2-  The only difference between confidence and overconfidence is hard work and dedication. If a person thinks that he/she can do the job and works hard for it then he/she is confident while if he/she just thinks that the job can done and doesn't put any effort whatsoever for the fulfillment of the task at hand then he/she is overconfident.

3- Increase our opportunities with confidence, and with overconfidence we loss the all opportunities.

Ex : I get the job from your company (confidence).

I only get the job from your company (overconfidence).

4- Confidence is a thing which give us an entrust about our ability to do a work and overconfidence is a thing which ruins our work and success. For Eg. Confidence says if you give a chance to me I can make it a golden opportunity with my effort and overconfidence says I had only one who deserve this chance.

5- Confidence means to be sure about self ability example I will pass exam because I know that I am fully prepaid for it 2) over confidence means to be much more sure about self ability example I will come in merit in exam it is my over confidence because to come in merit is not a joke.