Luckily you don't have go drop the engine to change spark plugs on modern water cooled Porsche 911s, but let me tell you about changing plugs on mid-engined Cayman/Boxster platform. The 4 cylinder cars are easier but 6 cylinder cars require 3-4 different combinations of sockets and extensions and tiny European hands to really get in there.
Yep! It’s possible to become a much better drive with track seat time. I’ve noticed that after 4 years of HPDEs, corners seem slower and I can place the car much more easily where I want.