It all depends on the person doing the learning, if your adept at setting up your own scenes, mixing & matching, doing your own lights & cameras, as well as making your own surface settings, then the curve is quite shallow and you just need to get used to how DS does things.
However if your one of those that rely exclusively on the content the venders setup for you and just load, pose & render, then the curve is near vertical, as you will have to learn to walk all over again.

Why!, because DS isn't a Poser clone, and as such many of the things Poser users take for granted are either useless, or need a lot of adjusting to get them to look right in DS.
Poser cameras & lights are a waste of harddrive space to a DS user, as are Poser Dynamic cloth & Hair.
The Material Room nodes are copyright Poser so DAZ can't replicate them in DS, and because of this the material folder and the .mt5 & .mc6 files are completely ignored by DS, as is the shader tree in any .pz2/.cr2/.hr2/.pp2, which doesn't leave DS with much it can use, and even that needs adjusted quite a bit.
Don't expect the DS presets some venders supply to help you out, most of them are made by Poser users who are clueless and have no idea how to setup a surface in DS, most of them end up in the same place as the lt2 & cm2 files, the trash can.