Oh.. I really know it.. when you drill the hole after carefully measured it all up only to find out there isn't quite enough leeway for it to fit, and if you try to redrill the hole, you now have a hole WAY too big and loose.. and then get all worked up and end up having to give it up for a while to calm down.. though there are other reasons for that ^_^ but yeah, if you keep making mistakes you are more prone to even more mistakes which just screw everything up. sometimes, not worth the effort.
specially when you could just add a decorative trim ^_^