Painting over a repaint

Ironracer said
Hmm. Many others are way more knowledgeable than I in this... so the single stage that's existing, you bare just gonna clear over that?

Either that, or just repaint the whole truck with single stage, then only clear coat over the B5 blue. I’m a total noob when it comes to painting cars. Been watching a bunch of YouTube videos and it looks easy enough.
I’m wanting the paint to look similar to this

Here’s mine