Originally posted by Kerensky97:
If you do it yourself it can be a pain loosening the engine block drain plugs. They're hard to get a socket onto.
You dont really need to do it. Easier way is to just drain whatever you can from radiator, then stick hoose and make water running through system, while engine is idling. That way incoming water will get out whatever left of old coolant in engine. Just need to figure approximate amount of how much of it will left in there, or use tester later on, to get proper mixture of antifreeze+water.