WolfThomas said:
Ookay, so, this seems to be how it works: (for the benefit of anyone reading this)
- Complete the BoS questline up until 'Tactical Thinking' begins (the quest is instantly recognizable as soon as it pings because its icon features a power armored vault boy stomping on a Railroad lantern).
You're told to talk to Kells. DON'T do this (because it turns the Railroad hostile, and without warning, oddly).
As an aside, the Danse situation is resolved
before 'Tactical Thinking', so you don't need to worry about him.
- If you're not already hostile towards the Institute, do something to make them hostile. Kill Father, or any of the department heads (that asshole Ayo is a good target for this). Other options are to tell Father to fuck off on first meeting him, or telling him to fuck off after the Battle of Bunker Hill. Going to Mass Fusion for the BoS will also make you hostile towards the Institute, but this is only possible AFTER 'Tactical Thinking', which we don't want to complete.
This step is necessary because you have to be hostile towards the Institute in order to progress with the Minutemen. (
http://fallout.wikia.com/wiki/Banished_from_the_Institute#Notes).
- If you've still got 'Underground Undercover' in your quest journal (for the Railroad), go talk to Desdemona. If not, you can skip this step.
She'll tell you to talk to Preston.
- Talk to Preston and do the Minutemen questline all the way to the end. At some point during this questline, the BoS questline will fail. (Specifically:
http://fallout.wikia.com/wiki/Defend_the_Castle#Notes). However not to worry, as I pointed out in a post above, this is a 'soft' questline fail, not a 'hostile' questline fail.
- Don't forget to issue the evacuation order on Father's terminal. Preston actually explicitly tells you to do this, and will give an objective in your journal about it.
- After the Institute goes boom, type the following into the command console:
setstage bos305 10
And you'll be directed to speak with Maxson, who'll congratulate you and give you your new rank of Sentinel.
Aaaand that's pretty much it.
Sheesh, and I thought the main faction questlines in FONV was a delicate juggling act. Still, in FO4 it
seems a lot more complicated than it actually is.