i paint the factory front sight a bright red, and i leave the white outline on the rear sight. some fluorescent paint will maybe give you what you want; but you sound like you've got your mind made up for something else. is the 'fire sight' one of those plastic sights that picks up light and kind of glows? if so, they strike me as a rather fragile affair on most firearms. i'd rather get some tritium night sights.
a book in the library, or a 'search' on the web can show you the schematic for that revolver if it doesn't come (like it should!) with an instruction manual. you'll see how easily they are taken apart with the right tools and a little patience.
i give you an 'A' on your purchase. i'd give you an 'A+' if you'd gotten the full lug revolver. it actually handles very well from the one i've used.
take care,
ss'