Is the trigger pull heavy or gritty, get an action job but never have your springs cut. Is the trigger sharp or uncomfortable, get it polished and contoured. Is the front sight hard to see, paint it fluorescent orange of another high visibility color. Have the cylinders polished, especially if it is a .357 mag. Have the cylinder chamfered to aid reloading. Have the crown polished or recut 45 degrees and polished and polish the bore. Maybe have the hammer cut to make it DAO. Grips I find are a personal choice, whether smooth or checkered, size and with or without finger grooves.