I clamp the hoses in the wheel well, then remove the radiator and catch whatever drains. You will still need to get some air out of the system when you refill, but not as bad as a complete flush. Tools needed are ordinary socket set (10mm and 13mm probably get all the bolts), some torx bits for the screws and I use a flat tip screwdriver to push the metal clips off
Check Pelican Parts Tech Articles if you need more specifics:
https://www.pelicanparts.com/boxster/boxster_tech.htm.