[A930Rocket]

I would get a variety of staplers… ie, hammer, electric, etc. and staple depths 1/4 and 1/2. All are cheap and you can experiment while you install, to find what works best. A battery powered and hand stapler will wear your ass out in no time. A pneumatic stapler is quick and fast, but will get old wrestling with the hose.

The 1/4” staples should work. Once the insulation is up, it’s not like it’s going to fall down again by itself.

Depending on the spacing of your rafters, the styrofoam baffles may stay in place by themselves or you could use a couple of tiger teeth to keep them in place. Then install the insulation.