Hello Kyle,
The generic ring expander tool will work fine. Try Napa or Autozone, they are inexpensive. Clean the carbon out of the ring grooves. The ring gap clearance is .004" per every inch of piston diameter. (eg. a 3.0" piston would be .004" X 3.0" ).
If the cylinders are not being bored to a new szie, make sure you de-glaze the cylinder walls well. If the cylinders are worn too much, re-ringing the engine will only give you an oil burner.