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Above everything, Google looks for your user experience. If you have a ton of 302 redirects you will have duplicate content errors, If you start changing 301 redirects you will eventually create a spider web that is hard to navigate. If you set up your 301 redirects and have to change a few, you should be ok. If you set up 5000 redirects and end up changing 4500 of them or creating duplicate 301 redirects you will eventually have really slow page speeds and bad user experience which Google will recognize and not like. 302 redirects are not common or best practice. I would avoid them all together.

Thanks for the Webinar-Link. I'll try to make it. I checked the guides and I liked them, explaining all the possibilities, what I was missing are recommondations how to use them