Here are Franny's videos on checking the head studs and adjusting the valves:
Head studs:
https://www.youtube.com/watch?v=uG9cFxtSfQg
Valve adjustment:
https://www.youtube.com/watch?v=6ciw3mDjz0k&t=315s
The valve adjustment is ideally done before the leak down test.
All of these are doable with the engine in the car.
As for a leak down tester, I'd post your location here and see if someone has one they will loan you.
Tom also has a great video series for the 3.2 and the 911 in general, here is his video on valve adjustment and a leak down test: