Work issue: taking over from a 10+ year expert, WWYD?

Maybe “bullshitting” isn’t the right word. It’s more like dealing with a high level of ambiguity or conflicting information. The reality is that is that if you are working in any sort of tech related field, there is a high chance that a lot of people don’t really know what they are doing for the simple reason technology and the industry changes too fast for people to really become experts.