Not impossible at all I solo night falls as no one I know plays and there's no matchmaking feature, and no I'm not gonna go out of my way to friend ppl, try to make strike teams etc etc... Matchmaking should be in game it's stupid that it's not. Anyway that being said they are completely doable just takes time.
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What in trying to say is you are fine they are not that hard to do especially with a team, so go ahead and do it.