Keep looking around you, keep practicing. There are a lot of things to do just right all at the same time and the only way to get good is practice.
You don't need to see the side of your own car in the side mirrors. Adjust them outward until things at the edge of the rear-view mirror are just coming into view in the side mirrors.
Leave the radio off until your're familiar enough with the driving controls to not fumble for e.g. the wiper control. Adjust the radio or your phone playlist etc. while you're parked. Apparently WA made it illegal to manipulate a phone in any way even while at a red light or stop sign. Find out what your specific rules are.
If some yahoo in a BMW just really needs to pass you, it's better to let them do it. At least that way they're ahead of you where you can keep an eye on them. And the faster they go, the sooner they get to their destination and the less time you have to share the road with that particular jerk.