The key to getting the filler perfectly flush is lots of sanding using a block like this

Painting is a little trickier, you paint the first coat going over the part that needs to be painted, then you reduce the paint 1:1 again and paint a larger area, then reduce it again 1:1 and paint a larger area etc etc etc until you can't see the fade.
Then you gotta clear coat it.

Painting is a little trickier, you paint the first coat going over the part that needs to be painted, then you reduce the paint 1:1 again and paint a larger area, then reduce it again 1:1 and paint a larger area etc etc etc until you can't see the fade.
Then you gotta clear coat it.
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