The only thing worse than misquoting from your sources is plagiarizing from them.
Plagiarism is easy to fall into.
Because of your inexperience with your subject, it will be tempting to use the more sophisticated language of the historians you are reading. In most cases, their expertise will enable them to make their point clearly, and it is easy to get into the habit of using their words instead of your own. Don,t fall into this trap. First of all, your instructor is also a historian and can tell the difference between the language of someone who has spent years researching a topic and that of the average history student. Second, and more important, is that thinking is learning.