Be very carefull undoing the trans hoses at the radiator...make sure you use a back up wrench.
Green antifreeeze is not a big issue...it's fine if changed regularly and tested for correct %.
Don't worry abvout block drain...most can't be undone anyway.
Catch all fluids...EPA vilation to allow them to drain into the ground or down the drain.
With the thermostat out too, you can flush the block with a hose after sucking all the coolant out with your wet/vac.
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