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In addition to what Woodbridge mentions to not have a problem with brush strokes showing, here are some more hints:
-get a good Purdy brush
-use the best quality paint from a reputable paint store
-oil-base paint looks smoother than latex
-paint in the cool of the day
-you must work quickly to keep a 'wet edge' everywhere
Also, here is a post on how to protect the vulnerable bottom edge from rusting
If the paint is fairly new then let it cure out for several weeks before sanding out the brush marks. Use 3M's green paper since it cuts cooler and doesn't clog up as fast as the others. Add a