It's fairly easy to access, as far as Outer Planes go. The only real things of note is that there ate "Gate Towns" that teeter between it and the other Outer Planes, and the Spire in the middle. The closer one approaches the Spire, the more 'neutral' things get, to the point that at the Spire's base, even the gods are rendered as powerless as mortals. This is a suppression effect, so lost abilities and the like return as you distance yourself from the Spire.

Interestingly, the Spire is in the middle of the infinite Outlands, and the city of Cigil is at the top of the infinitely tall Spire, visible to the naked eye. Don't think about it.