First off, there's a not painter on the face of the earth that can blend a 3 stage paint the size of a dime successfully.
That being said if you do what the other poster said you'll end up with a bullseye.
(1)Blend out the groundcoat,(2) then groundcoat with the pearl mixed in it,(3) then pearl coat, (4)clear with pearl in it,(5) then plain clear on top. Blending out FURTHER with each coat
Steps 1,3 and 5 are the 3 stages of a tricoat. Steps 2 and 4 are optional but help the blend.
The Nexa/Autocolor paint manual actually has 7 steps for a 3 stage paint job but I'm to lazy to go look for it in my garage for the other 2 steps.
Just my .02 worth