[[I have been trying to grow sweet potato sets for planting without luck ]]
If you are picking them up from the grocery store look for the medium to larger ones and try to pick them up from different places.
(better chances since some are sprayed and may or may not sprout ) All sizes from my garden sprout easily through (I leave a few in the garden over winter to dig up and sprout).
Stick them half in water holding them up with toothpicks and set them on the windowsill.
Some of them should sprout .
Once you get sprouts let them get a couple of leaves and break them off . Some people plant that straight in the garden , some soak them in water until they begin to get roots . I found that sticking them in peat pellets until they root up works better for me (my soil is really sandy and they take off much better for me if I put them in with some roots )
Yeah, I know all that. I’ve just been unlucky this year