I usually start with blinders on my glasses on the side the sun is coming from. As the sun starts dropping in the horizon (evening) the side shields stop working because you have to turn your head toward the direction of the sun, the side shields rotate with you and whammo, you're blind. I'm sure all of us can tell when that's going to happen. At that point, I bring out the sun dot but usually don't bother removing the side shield on my sun glasses.

One little tip on the sun dot is to set it as close to the side of your head as possible. It's easier to get it positioned properly and accurately and allows more head movement without getting blasted by the sun. The reverse is true the further the sun dot is from the side of your face where a fairly small amount of head movement will get you away from the protection of the sun dot. I use mine primarily in the evenings at a field where the pilot faces north and the sun dot is always on my left side (west). I'm sure it would work in the morning as well when the sun is very low in the eastern horizon, but I don't recall ever using one in the morning. Just so there's no confusion, the sun dot is designed to shield the pilot from intense side-light. If the sun is out in front of you, the sun dot would be useless.

Verne