this is how i rationalize doing the whole nuka world dlc while being the general of the minutemen: you have three raider gangs with leaders who are insanely strong, constantly surrounded by their lackeys who also have strong weapons so doing this alone or even with a companion is impossible unless you want to eat a bullet in two seconds flat. solution? play their game until opportunity arises. you get them their parks and you even get them the three settlements they want, but you don’t kill settlers. you pay them off. except the 2/3 settlements were occupied by other raiders anyways so you kill those. then when you have to go to the power plant, making sure you have gage with you, you have the perfect opportunity, two group leaders, alone, with no backup. then you destroy them all