How should I prep for a color change over existing good paint?

Finished the door and fender yesterday,and it was a scramble. My neighbor had to leave town for a work event, so I was rushing to get the door put together last minute. The paint turned out okay, a little bit of orange peel and a couple small runs. As mentioned, proper lighting would've helped tremendously, I think.

I'll cut & buff to make it pretty. Unfortunately I didn't have time to blend the panels, but I think the color looks pretty darn close. I'll post pictures of the final product when I can. Here are some pics right after I finished shooting clear.

For anyone reading and learning, DON'T HALF *** YOUR MASKING JOB. Mask EVERYTHING. I was surprised at the places overspray turned up.

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