No need to cut anything. Follow the small hose from the thermostat, it goes to the heater. Where it goes into the firewall, the other heater hose sits next to it through the wall. Both can be separated in the engine bay.
Use a hose pipe and flush both ways a number of times. It helps a lot to fill the heater and blow it out with short sharp flows of compressed air.
Just use the air to blow water out. Don't pressurize the heater element.
If you want to see what comes out, flush into a white bucket
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