how do i paint finished furniture? follow up q'?

Posted under black futon

i just asked a question about matching furniture
well i decided to painy by brown frame futon black bc the color is faded and its hard to find matching furniture.
but the frame is finished, and its glossy dark wood. now to paint it, do i just buy black paint and do it? or do i have to do something to the wood first?
thanks

There are very few paints that would take to the treated wood without sanding first. Sanding the frame would make the process a 100 times easier and faster. Good luck!