In reply to The Lemming:
Don't let the organisation of your catalogue get away from you. It's much easier to organise and tag things as you import them, rather than have to do several thousand photos later on. It can also very useful to have a metadata preset and a develop preset that you apply to every photo for consistency - for example I have a metadata preset which adds copyright and licencing information to everything imported, and a develop preset which sets the camera profile to 'camera standard' (as opposed to Adobe standard) for every image that I import.
If you have a bunch of photos all taken in the same conditions, it's quicker to process one and then sync the basic attributes (exposure, CT, etc) to that one, rather than do them individually. Tweaks can then be made individually as necessary from what should be a good starting point.
If you hold down the alt key while tweaking certain attributes, you'll get a more useful view of what you're doing. For example if you hold it down while adjusting sharpening masking, it'll show you what areas of the photo are being masked.