Success requires saying  No  to yourself on purpose
 

1-The main reasons you are in trouble are always your answers. If you don't know whether something can be done then it's nice to say I've got some other work to do first For example, some performers can be with one program, and if they're both at the same time then don't take them both at once.
2-most of the time we make ourselves horrible  why 

it's the knowledge we don't know how to say no to ourselves as well as others
sometimes you don't like something and you will not express it, it can mess up your own life and brain
if you don't want to do what the other person commanded on you may be you are busy with other things then you should inform the person or head