Christopher Tidy writes:

I also need some lens-removing tools. Not sure what they're called.

You must mean spanners. Edmund Optics, Thorlabs for some pricey ones.
Ebay for a budget type.

Often the rings are hardly tight, and can be turned out with the tip of
a tiny screwdriver on one side, or the filed-down tips of needlenose pliers
on both sides. Give it a try.