It's not difficult, but might be messey. You will need to buy a gallon of distilled water at the grocery store - not spring or drinking water!
There is a drain on the block and one on the bottom of the radiator. I cheat and just pull off the large bottom hose from the engine block - can be a bit messy if you don't have a large catch pan.
If you decide to repl the thermostat, now is the time to do it. Just make sure you have a very good 40 torx driver.
After the fluid is drained and the petcocks or hose is fastened back to the block, fill up the engine/radiator with distilled water and antifreeze. I prefer to add 1/2 gallon of antifreeze, followed by 1/2 gallon of water. Then I pour the rest of the water into the antifreeze bottle, and fill up the overflow bottle.
Start the car with the cap off the overflow. Add fluid when needed. When the engine appears to be warmed up, turn it off. Wrap a cloth over the large hose and squeeze it several times to get any air bubbles out (the engine must be warm enough to have the thermostat open). Fill the bottle to max line and put the cap on.
Go for a drive and make sure there are no leaks. Check the bottle level again when the engine is cold. Fill if needed.
Klaus
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