It doesn't really matter if it's a good idea or not right now. It's something you do entirely in post processing, which means you don't need to decide one way or the other prior to the shoot. Just make sure you take at least a few shots that ALLOW for a good selective color composition, and then we can all toy around with them later and bicker about saturation until we are satisfied (assuming you are willing to share

). if you hate it, then you will still have a perfectly nifty close up shot that works even without the selective color, for your collection.