I think that Jefferson, a man of magic, could potentially act as a guide for Emma. It would be a great way to make him a regular part of the show next season. Once he has his daughter back, perhaps his sanity will be restored, especially if Emma helps him. IMO, Jefferson would be a much more palatable guide for Emma than Rumpel, who isn’t exactly trustworthy and may have an ulterior motive that isn’t in Emma best interests (e.g. her death).
On another note, I think it’s possible that Maleficent’s SB counterpart, who may remember FTL, may have a role in helping Emma break the sleeping curse. She did make it in the first place. She may tell Emma to wake Henry with a mother’s true love kiss.
Finally, I definitely called that Henry would eat the poisoned apple meant for Emma and that her kiss would most likely revive him, thus causing her to believe. Added to that are August’s words that only Henry could make Emma believe. The promo stills of the finale add weight to that in that we see Emma leaning over Henry's hospital bed to kiss her son on the forehead, followed by another still of Regina's hair being blown back by a force of wind, as if the kiss breaks the sleeping curse. In the promo, we also hear Emma say the magic words, “I love you, Henry.” Her true love will save her son. Also, the episode promo reveals that Henry's book is glowing as Emma touches it. I think that is the moment she actually believes and magic comes to SB.
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy