Legendary

So anyway I tried beating halo 2 and 4 on legendary and I got stuck on halo 2 for obvious reasons and halo 4 has this really long boring tedious level that I just gave up on so now I am trying to beat halo reach legendary and I got to the night sniper mission I cannot remember what its called anyone have advice for the level I’m on and future levels?

Look up speed runs from youtube and literally run the same path lol. I used this technique to beat halo 4 solo legendary. I know what your going through right now lol it sucks