Trying to gather up all the tuning videos in one place. Most of these are most applicable to new harpists, or those with new harps, but the troubleshooting one may be of interest - well, I hope in all of them you'd find at leasst one worthwhile thing. And it is easy to slide into habits that may not be the best for your tuning pleasure or that of your harp.
the really really long "watch me tune a harp in my system" video
tuners - a quick overview of what you should know about kinds, settings, etc.
tuning problems - I'm talking about what I've heard from many students over the years about the various problems they might experience when tuning.