Make sure you know how to use a freewheel remover. There's very torque involved in removing freewheels, and it's easy to break the two driving dogs off the tool.
To prevent mishap, use an axle nut to hold the remover securely to the freewheel so it can't jump out, then as soon as the freewheel breaks free, be sure to loosen or remove the axle nut so the threaded freewheel has room to move out. Otherwise, you'll destroy the axle or bearings, or both.
Many freewheels are on so tight that you won't get them off with a wrench. The best way is to assemble the remover with the axle nut on as I described, put the remover in a vise, then grab the rim in both hands and twist to the left with all your strength. Again, stop once it breaks loose, and back off the axle nut.
BTW- a freewheel remover should cost you less than $10.00, or you could bring the wheel to a bike shop and have it removed for $5.00 or so.
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