Don't forget to mention getting gearbox grease all over yourself.

Regarding marking the flywheel components, you might do that if you putting the used pressure plate back on. With a new plate, no worries. A-series flywheel is not externally balanced so no need to mark it. My Nissan factory manuals do not say to mark it.

I had my flywheel & pressure plate balanced when I had my flywheel lightened....but even then it still only fits one way.

I'd even be tempted to mark a new one - but with this new clutch aligning tool I've got you can clamp the pressure plate and clutch together in a single assembly - makes it a bit easier....