Straightforward, not as bad as manuals look. Some tips:
There are 11 loose bearing balls, but if gummy inside, they will not spill out
During reassembly, slide all nondrive side internals onto axle and insert thru nondrive side hub. Then insert drive side.
Good luck and have fun!
Maybe same outfit as fake Harley Davidson eBay bike similar modus operate. Even the notice to buyer language similar.
Post in thread 'It's Back !!!! Fake HD on ebay' https://thecabe.com/forum/threads/its-back-fake-hd-on-ebay.205173/post-1402371
The 12 splined, 20mm OD (outer diameter) remover tool fits older Shimano made freewheels. Various aftermarket but often sells out, Eg, https://www.amazon.com/BIKEHAND-Bicycle-Shimano-Standard-Freewheel/dp/B088WPGMXZ