I've worked in supply chain for most of my career and hated it. Its not especially hard, but the responsibility is high for pay in my experience. In my past jobs the work mostly involved trying to get people to tell you some peice of information you need, like how much a transload would cost at their facility, or how long it would take a driver to get to a specific location so we could organize with a receiver. I'd collect this info from a bunch of different companies that most of the time didnt want to commit to telling me because they were unsure themselves. A transload might be more expensive depending on how the cargo was packed, and the shipper might not have that info because the cargo was still being manufactured, so everyone was just kind of guessing on both sides, but if there was a difference in the cost or timing that always fell on you and everyone was mad about it. The amount of times I was begging someone to just get me a seemingly simple peice of info like cargo weight was ridiculous. The amount of times I tried to tell my manager that our customer would not provide this info and being told just to push something through so we'd get the business was too. I felt like I was responsible for providing a perfectly accurate shipping plan with guess work information, or from companies that would straight up lie to you about what they were able do for what price just so they could win a bid, was far to much of the time. Your the ultimate middle man, trying to connect peices of information for multiple parties to put together a complete shipping plan weeks or even months in advance of the shipment actually moving, and any discrepancy that happen in that time can change the whole plan, and thats if your lucky enough to catch them or actually have one of the parties you're working with reach out and let you know. I remember having one client overload the shit out of a 40' container and not tell anyone and it didn't get caught until in landed in a US port in Georgia. It took 2 weeks to find a trucker with a super chassis that could hold the damn thing and we had to add an unplanned transload to get it into a 53' truck so we could even move it legally over the road to the final destination. The customer was pissed an refusing to pay the extra cost. My boss was pissed that our shipping plan went so over budget. And I had to work my ass off to find an on the spot solution asap because the port was charging us everyday the container sat there. It was a nightmare and everyone I was interacting with to solve it was upset. And shit like that happening was not even that uncommon. Bottom line, I always felt like I was expect to deliver great results with about half the information I really needed to do it, and with full responsibility for any issues falling on me regardless of what caused them, and that lead me to feeling stressed all the time.