I have downloaded and installed Daz, looked at it for ten minutes, dragged a body randomly across the screen and given up more times than I care to remember over the years. Having said that this time it felt quite easy to get started, still early days of course. There’s clearly a huge support network of people who’ve been doing this an awfully long time to lean on.
I think the main things it requires are patience (to find the right asset, tweak poses and faces, trial and error rendering) and getting those assets in the first place. I saw the sale was on yesterday or the day before and bit the bullet knowing that investing some money in it would make me put some more time into learning. I’ve probably spent £200 (Edit: on inspecting my bank account it's more like 400-500, help) or so on stuff in the store (and I really really need to stop for a bit now lol) so yeah I don’t think it’s cheap to get the higher quality stuff on the Daz store that will go a long way to making better renders, and I get the impression you definitely have to spend a lot to get a variety of hairstyles and if you care about them clothes. Also my computer is not bad and it’s struggling with some of these so I’d definitely download Daz and see how it copes with rendering free stuff before you commit.