Here's how to adjust your mirrors so that you don't get blind spots.
I'll try to make the instructions Cross the Pond proof.

Sitting in the driver's seat, lean your head close to to driver's window and adjust that mirror so that you can just see the side of the car.

To adjust the passenger side mirror lean towards the middle of the car and again, adjust that mirror so that you can just see the side of the car.

The new views take a little getting used to at first as they are unfamiliar. To check that they work watch a car approaching in your inside mirror; as it disappears from view, it should come into view in one of your side mirrors.