Can someone identify this?

[LJA]

Should I even be watering it from above the moss, or should I be putting the pot in a container of water to soak then removing it?

Either way is fine, but I would still unpot the plant to see what condition the roots are in, and to check out whether it's potted in moss all the way through, or whether the moss is just layering the top. If it's moss all the way through, the roots will stay wetter longer than if it's something else, like a bark mix, and you'll have to take that into consideration with your watering.

I'm going to try to cut the tip off that leaf, using your advice. Should it be cut straight across, or at a point, or does it matter?

It doesn't really matter, but the plant will look better if you make the cut in a "V" shape following the outline of the leaf.