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Southern Flannel Moth Cocoon/Pupae question

Hello, I am wondering about the extraction of the pupae from Megalopyge opercularis cocoons. I currently have ~6 cocoons on my fence, the most recent one was just spun yesterday with the caterpillar clearly inside working away. I managed to find one caterpillar on my fence which had not yet begun making a cocoon, so I took it, put it in a net, and it began making one that evening.

For the rest on the fence, I am wondering if it would be difficult to cut open the cocoons and keep the pupae in separate containers? This seems to be a rare opportunity, as I can find only a handful of photos of the pupae out there. There must be a reason, perhaps you can still be stung by the hairs in/around the cocoon? Maybe because the caterpillar is deemed dangerous, few are willing to contain them? Is it otherwise difficult to remove the pupae?

According to this page "Individuals of the fall generation overwinter as larvae (prepupae) and pupate in late spring of the next year." Should I worry about waiting to open the cocoons? It looks like Jeff Hollenbeck was able to open a cocoon pre-pupa and it successfully pupated here . I am aware that if I have to deal with the pre-pupa, the spines would still pose a risk.