Labeling of past blogs

I am trying to go through and label/tag past blog entries that i didn't initially. The ones that I wanted to do the most were the numerous "Best of's" from over the years. Issue is, blogger SEVERELY limits the amount of tags/labels I can do. So in the instances of the Best of posts, not all the information I would like to be there, is or can be tagged. I do apologize. I am trying to make the tags/labels the best i can given the restriction of 200 characters in total. ouch!