Working with sources is not easy. You know it. Teachers know it. They expect you to have questions about why, when, and how to cite sources. While you are learning to manage and use sources, instructors will usually help you address mistakes and avoid plagiarism that’s obviously accidental.
Teachers are not so understanding if you deliberately plagiarize. It’s wrong to turn in someone else’s work as your own, to pass off parts of others’ work as your own, and to deliberately fake sources, no matter how you rationalize these acts. The penalties for deliberate plagiarism are justifiably severe and uncompromising.
So plan ahead, no matter how busy you are. Ask for help when you need it, and don’t cheat. Too much is at stake for you not to do your own work.