So, today I've seemed to have learned that the brake lines are probably put in first in the engine bay. They are a HUGE pain in the ass to get to.
They run along the back wall between other parts, hoses, and cables. After unhooking the lines at the master cylinder, I found it easier to just cut the existing lines and rip them out. I tried to save the brake clips that hold them against the wall, but will likely need to replace them.
What's nice is that my cousin was able to find a pre-bent brake line kit, that I hoped would all be installed today. I was only really able to snake the long front line across the back wall of the engine bay and into the wheel well into place. Rear brake lines would have to wait until next time.
