How do you take off a freewheel without a tool?
+1, as above ^^
you destroy the freewheel.. take it apart, all the bearings fall out,
then you put the core in a Bench vise and unscrew the wheel.
No 'most of the time' It's 100% ...
If the tool is different than the one you need with the new freewheel
take the wheel to the Bike shop, use their tool , for the fee,
and then you don't have to trash the freewheel you removed.
Break a right rear spoke and you will want the tool on hand.