The first time, it's an intuition. The universe pulling me towards it. After I've been to a plane, I can always find it again though.

[But there are some that are like...fuck no...never going back.]

Tracking is a part though, if you're following someone. People leave traces in the Blind Eternities, so it's easy to follow another Planeswalker's trail. Unless they're really good at hiding it.