The most we can hope for when we write anything is dazzling imperfection. The least we can hope for is accolades from one or two people who don't know us. Spending all afternoon on "the right word" is probably foolish (though I've done it many times), but then again, it may not be. There may be people out there who'll read that nearly-perfect sentence (or paragraph), with its "right word," and they'll nod and smile and say to themselves, "Hey, that's not too bad.