I actually read "Never Split the Difference" a couple years ago! Initially just to prepare for a salary negotiation but I found it to be very useful in many other ways. Your second recommendation is also appropriate: I had a ton of latitude to build and configure whatever hardware was needed to solve $BUSINESS-PROBLEM (which was often very exciting) but it was done in a bit of a vacuum without any mentorship. Adapting to a more rigorous/larger/slower working environment is exactly what I need to do.

Great suggestions and thanks for taking the time to respond :)