confidence is a strong point for every person for doing any
work but we going to do any work and we really dun't know
the how much strength we having need for doing that work &
we accept & feel confidence much than our strength & ability
what we have in ourself. e.g if we see a stone in our way &
try to remove that in one side of way but if stone is much
heavy than our strength then we should take some help from
other people other wise we will just waste our time in this
effort. it is main different between confidence & over
confidence.

Actually there is only a little bit of difference between 
confidence and over confidence, when you think that you can 
do a particular job that can be called as confidence but 
when you think that you only can do that particular job is 
over confidence.

This is a nice question to answer. Actually there is just a bit difference between Confidence and over confidence. We someone knows that he can do a particular task, its called confidence but when someone knows he'll do something which is more than his strength and neglects other people and the basic things, and hence he fails.

small differece is there between confidence and over 
confidece.. i will tell that i can do this work.. this is 
confidence.. i only do this work(NO one can't do this 
work). this is overconfidence

confidence - i can do,

over confidence- no one can do the things perfect as i can.

CONFIDENCE IS WHICH COME IN YOUR WAY (YOU CAN )
OVER CONFIDENCE UR PREDICT "THAT COME IN YOUR WAY" BUT IT
RUNS AWAY  SKIPS FROM YOU LIKE BANANA SKID (YOU CAN'T)