What is a good method to cut many rigid foam board pieces for rim joist insulation in a big tight crawlspace?

As the title says. I’m confident I can insulate our rim joists in our crawlspace with rigid foam but I’m 6’1” and our crawlspace doesn’t have the most comfortable clearance.

Seems like measuring and cutting rigid foam will be really hard while in the crawl.

Do most people simply under size and cut many many pieces and leverage canned foam to cover the gaps instead of going for a tighter fitting rigid piece?

Thanks in advance !