nintendo 3ds repair!

My boyfriend recently gave me his childhood 3ds XL, and I successfully modded it, but a minor damage in the hinge led to the ribbon cable having a small impact on it, and the top screen is not turning on. I found the necessary supplies on amazon, thank goodness i don't need a new screen itself, just a new flex cable, and once I get the money for them (cause ya girls broke XP) I'm very nervous but excited to do this repair! any N*ntendo console nerds have any advice, I'd really appreciate it :3