My standard interpretation for Saturn transits to natal Neptune. Please understand that it was written way more upbeat than might be warranted for accuracy, because people having this transit need a slightly absurd upbeat way to look at things, to get through it easier.

Dreams and ideals now become grounded. If well formed and realistic in the context of your life, they are made sounder, and steps are taken to manifest them as concrete reality. Otherwise, be prepared for some healthy disillusionment, freeing your imaginative energies for more practical ends. Either way,
certainty is a theme of your thinking and wishing patterns right now. Your ideas of what is real, "how things are," "what is going to be," are keenly focused by your wishes, and tend to be rigid. This trait bestows a powerful ability to focus on a goal; and yet taken to its extreme, it also may limit your awareness of problem-solving options available to you, possibly leading to the emergence of private demons to haunt you: troubled mental states, frustration, suspicion, and despondency. Instead of tightening your attachment to preconceived ideas, why not make full use of your ability to make practical goals a physical reality?
IN BRIEF: Ideals and dreams are grounded. If sound, they are made solid, secure, real; otherwise, frustration and disillusionment. Security and certainty seem important to you. Personal demons and troubled mental states may emerge. You have more options that you think!