I have next to no knowledge on how to reverse engineer unity games, any tips?
To be honest, you need to just dig into the subject because otherwise it would require a whole guide on many different aspects.
Good place to start your adventure is to search for UABE - Unity Assets Bundle Extractor - so you know how easy it is to extract assets like sounds, textures and such. Models are a bit trickier since they often need to be recreated in Unity Studio or something similar. It's been a while since I've done it myself (last time was back in 2020, messing around with Guilty Hell 1, trying to change colours of some models, only to find out most animations were pre-rendered and not actual in-game animations).
Generally though, it is hard to find an easier common game engine than Unity (maybe UE3 but it has its own quirks) to start learning how reverse engineering works.
Below some freebies to help you understand what to look for:
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And for the extracting the models themselves:
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The rest is up to you since it's an adventure like with programming - a lot of try and error and googling to find out how much you don't know yet
Don't be scared though, it's easy when you actually dwell into the subject for some time. For me it was around two evenings of casual looking to figure it out but I was messing with game files for ripping and cheats since I was 6 years old, so I might be a bad example