I used a turkey baster to remove the minimum amount of coolant needed to do the install with making a mess. Disconnect the top and bottom hoses, remove and install the new reservoir, connect the hoses back, and refill the tank with coolant. Just to be safe, I ran the engine for a few minutes with the cap off and the coolant capacity full until the heater came on. Put the cap back on and take it for a test drive to ensure no leaks, etc. The coolant tank is high enough up in the engine bay to where a full bleed of the system isn't necessarily required, although it wouldn't hurt. I didn't need to, however.
2006 with NC3 front end | OEM hardtop | full header/exhaust | FM stage II suspension and Wilwood LBBK | Blackbird Fabworx GT3 roll bar | TRMotorsports FF10s.