so i'm wanting to paint my interior door panels to match my painted trim...do i need to do any sanding at all? i'm sure i stilll need to primer but not %100 sure..so do i ? thanks guys.

No, no sanding is needed, if you get "krylon paint for plastics" (can find at walmart). this paint is a prepless paint, and you just spray it on.
I assume you mean the plastic part of the interior panel? the sqooshie stuff may not paint too well, although I have never tried.
Pic of my krylon paint. Just dont treat your celi like a truck and it will stay on, mine has only chipped on the door sill, on the passengers side from retarded passengers lol.

Mine looks just like his. Hasn't chipped and takes about a day or 2 to do. krylon for plastic at walmart you need about 7 cans. Light coats wait about 10 minutes in between each coat. Mine chipped in 2 places bc I didn't let it dry all the way when I put it back in.