WP, Thermo, and then Coolant flush?

[soundguy]

Bought a 97' base Boxster with 100K, and I'm going to do a new WP, thermostat, and a thorough coolant flush. Not sure what kind of coolant is in there right now, but it's not pink.
My question is, does the order in which I do all this matter? Drain system, replace parts, flush with water, drain again, and then add new coolant as final step? Am I overthinking this?

Thanks in advance for your help.