I know the exact reason it reads high: you've over filled it. If it's a 4.5 qt job (or whatever). I put in 4, check it, add a little, check it, repeat. That's the only way to know. After you've done this once on your car, you can right down the exact amount it takes for next time. Many people use a Sharpie and write this on the bottom side of the hood.
It's really not that hard to let out just a small amount. Just loosen the plug until it starts draining slowly. Put it in a container where you can see the volume.
Lastly, on your refill measurement, make sure you're consistent on what you do with the oil filer. Since ours is completely inverted, I pre-fill mine to help with start up flow.