Blog Labels

I have been putting some labels on some of my archived posts, but by doing that it makes them showup as new posts in the blog RSS Feed and pushes todays stuff off. So I have stopped doing that for the time being. This blog has a large number of posts (1,566) and I am not willing to add labels to them all in one sitting and I am not sure if that is worth it. But I would like them all to have labels for consistency's sake. So as compromise I will probably do a few everytime I go a few days without posting just before I post something new.