I actually did the human street rat personal story, the level 8 one at level 6. It wasn’t a cake walk for sure, but I did survive it with a rally or two. None of the story quests I did afterwards were easy either, but as they got stronger, I was able to devise some sort of strategy against them with not an incredible amount of effort.
It should be difficult, and possibly harder than other events you can do solo, at least this way there is some sort of challenge in the game. I look forward to more of them, just make sure you have appropriate gear and runes on your armor and you should do fine as long as you have a plan.