I've recently witnessed someone with barely any SQL skills grow leaps and bounds within a two week period.
Not only did they learn a great deal about SQL, then migrate that into an SSRS report, but then, elevate that data into Power Pivot with Slicers and the whole nine yards.
He saw the potential of SQL to get the data he needed. Then saw the limitations of SSRS for the users with too many rows. Then taught himself Power Pivot in a single day. What a transformation.
It's was quite an amazing sight to witness.
Quite a transformation!