I've run into that latter when dealing with new engineers when working oil field.
I rent water pumps and related items.
We had an oil field customer (new engineer, fresh out of college) that was put in charge of setting up his first water transfer.
He sends over this huge list of fittings they need for this job. Quite a bit of it we had to purchase, so my boss worked it out with them that we would supply the items for purchase.
Me, getting all this stuff together, and being part of these jobs before, I had a pretty good idea what they were trying to do.
So when I took them all the items they ordered, plus the equipment, I also threw on a couple manifolds we had built and rented for similar applications.
So I get to the jobsite, and sure enough, I was right and those manifold would work perfectly for the job.
So.... I sell them all the fittings they ordered, plus rented them the manifolds that I brought along, since the employees stated we're gonna use the manifolds since they could tie into them with a short hose and be up and running.





The engineer learned a lesson that day. Instead of trying to figure it out all on your own, consult the folks that do it on a daily basis. Chances are good they have done similar before and can come up with a quick solution.