Fungaia's video on pressure cookers may be very helpful to you! It doesn't go over the specifics for chicken manure, but goes over pressure cookers in general and is very informative. It also goes over lots of different types (instant pot/presto canner/etc) so you can choose the scale/price range that fits your goals. And besides the PC video, there's quite a few other diy cultivation videos to watch. Hope something there might be helpful c: Good luck, and mush love!

It’s more sanitary to use (compost, mulch, chipped branch wood, green manures), and mineral supplements.

Not with chicken manure, kinda hard to grow stuff with it (it's probably possible, but not for newbies). I'm assuming you are growing coir lovers, not gourmet mushrooms? Generally a pressure cooker is good, but it can depend on the media. If you are new, look into brf teks, they're a pretty decent place to start, and I'd recommend jars in the instapot, not bags.