Speaking of greasing the bottom headset bearings. I recently read a Sheldon Brown article about them.
Overhaul
Headsets are pretty durable, and hardly ever need to be serviced if your bicycle has a front fender.If you ride without a front fender in wet conditions, the front tire will spray filthy, gritty water right up into the lower race. (It is the lower race that supports your weight. Most headset failures occur at the lower race.)
https://www.sheldonbrown.com/headsets.html