Isaiah's Writing Style: Repetition
I remember reading somewhere that Hebrew poetry uses repetition a lot, instead of rhyme (and maybe meter). In Isaiah 2, this is really evident. The helpful part of this is that if you don't understand a phrase or sentence, the prophet always repeats himself, so you have a pair of analogies to use as similar sayings. They are often finished by testimony or admonition.
Isaiah 2:3
Isaiah 2:4
Isaiah 2:5
An invitation
His style is also helpful with confusing verses:
2:7 - horses / chariots
2:9 - the mean man / the great man
2:10 - the rock / the dust
2:11 - the lofty looks / the haughtiness
2:12 - proud and lofty / lifted up
2:13 - the cedars of Lebanon / high and lifted up / the oaks of Bashan
2:15 - high towers / fenced walls
2:19 - the holes of the rocks / the caves of the earth
2:20 - the moles / the bats
2:21 - the clefts of the rocks / the tops of the ragged rocks