Are too long pants ok?

I’ve been invited to summit Shasta, CA. in late May.

My usual pant size is 36x32, with a 29” inseam.

I don’t want to buy new, so I’ve been looking on eBay. There’s plenty of pants with 32” inseam, but I’ve read somewhere that crampons catch on pants that are too long. So, would it be a problem?

Also, this is my first time mountaineering. I’ve been eyeing oversized Marmot scree pants which is why I made this post. With a base layer, will they suffice or will I need something insulated?