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@TheBrick(Tommy)
I read some where about some one using a peace of webbing (like a long strap) wrapped round a section of the rim with a knot in the other end then the webbing force between two cogs. Now when you start trying to undo the lock nut the freewheel will spin but it will have the webbing jamed between the cogs. Once all the slack is wound round the cogs you will have a secure casset which to torque against and undo the locknut.
As far as the lock ring goes it is only the last cog on some old hubs (really quite old I think, maybe 1st generation?). If you have one of these types of hubs you will need two chain whips. Or one and use the webbing method above to secure the main casset and the chain whip on the lock ring cog.