Just the fee of your time sorting through which services you need and then the docs for those services - assuming of course you chose the correct service(s)
It's pretty annoying to do it yourself, but AWS also offers a lot of free time with their sales/accounts teams. You can just say, "Hey, I want a service that does _____" and be pointed at exactly what you need.
All the major clouds are the same, though. You have to sift through a lot of marketing pages and docs to find what you want. It's still better than the old days of managing it all yourself.
No different than sorting through which libraries you need to use and the docs for those libraries... That's... That's the job.