Many came to work after school and educational institution, still can not understand that no one is obliged to keep you in the workplace. Here is where the executive and tudovaya discipline. You were hired to perform it, so the problem is not the chief, if you do not do the job, and yours.
The phrase "I can not" immediately puts you in a list of employees scheduled for layoff. Even if the operating instructions are not part of your duties or you do not understand what is required of you, grasp the execution. Ask to explain the task, you can have contacts who can help you understand what is required of you. In any case, there would be nothing wrong if you go to your boss and specify, whether you are going to operate under its orders.
The words "I do not know" is also not necessary to say. If there is something you do not know - you should own to fill this gap. Education does not mean that you have received the final package of knowledge. The rest of his life you have to learn something new and to learn constantly. Do you know something - there is colleagues, internet and specialized literature.
Stupid and provocative sound of the phrase "It's not part of my duty" and "My working day is over." If there is such a need for production, it is necessary to take and do. Think of it as some trust and faith in your ability, then you will be able to help out if needed.
Even easier to hear in response, "You're fired" after the words "In serious companies is not done." The first reaction of any chief will offer you resign and leave, once you express disloyalty and doubt the solidity of his company - the employer.
Try not to make such mistakes, and very soon you will be able to establish itself competent, disciplined executive and employee, which your company will be able to appreciate.