Ringing the Changes

I would like to add a 'Facebook like' or share button to this blog, but the existing template dates back to a time before widgets were invented and there is just no way :(

I'm a little loath to update the template at the moment because it involves extensive customisation and I've never progressed much beyond good old-fashioned HTML (the version that was in vogue in 1997!), so I'm undecided. What do you think?