1. You will feel awkward. Holding circular needles, or any needles for that matter, and a ball of yarn at the same time, trying not to drop any stitches, watching and re-watching knitting videos, and trying to pay attention to what's going on around you is quite the challenge. The good part: it gets much easier. Soon the movements are second nature and you're able to knit while FaceTime-ing, waiting in line running errands, and in the car (while someone else is driving, of course).
2. It's okay to start over. In fact, it's better to start over the minute you notice things have gone awry. Unraveling 2 rows of stitches is way easier than having to un-knit (it's a thing now) by hand 5+ rows after you realize you've got a huge random hole in your work. Simple point: the starting over makes you better.
3. Keep going. It's actually the thing that gets you to the end. Crazy enough. If you stop, your work will stop. I think this is the thing that has stopped me every time so far. Just keep swimming.... er, knitting.
4. Finish strong. Well, I assume I'll learn this. I haven't quite gotten to this point yet. But hey, I've only been knitting for a few days. We'll get there. [See #3]