don't complete the mission, mass fusion, and destroy the institute with minutemen, you can do all other quests before

This guide is needlessly complex, and locks you out of some unique loot if you're the collector type. The only things you need to make sure to not do in order to keep everybody on your good side is avoid any of the quests that villianize another faction.

(such as Tactical Thinking, Rockets' Red Glare, End of the Line, Airship Down, and failing to evacuate the Institute during The Nuclear Option)

However, being friends with everybody could lock Danse's unique perk out, since it's only able to be acquired from him after completing a quest for the BoS after giving them the Network Scanner (Which can't be done without siding with them, subsequently starting Tactical Thinking after completion)

i already did the road to freedom quest so i made my 6th new save

you could play with BOS and institute quest line up until "mass fusion and do spoils of war" but don't finish "blind betrayal" or else ingram won't talk to you for "spoils of war" quest thus making institute an enemy after that defend the castle and nuclear option with Minutemen and issue evacuation order to be in railroad good side of course BOS didn't seems to approve it but they still friendly with player

Actually I learned recently that you can play all sides against eachother pretty much until they ask you to destroy the other factions, you can even play the institute up until Mass Fusion, activate Liberty prime, and even finish the game with the Minutemen but still have the giant robot stomping around the airport.

I have tried several variations of this. It SEEMS you can do the blocks of missions for each faction in any order as long as you don't step on any of the other blocks, in other words you can do any of the First Set of missions for each faction but you still have to do the other factions first set of missions before doing any of the second sets.
And you still have to do all the strings of Missions Prior to 'Reunions'. And you can start organizing the settlements right from day one, BEFORE you join a faction. Still trying different ways to play F4. It will be one of those games you never tire of.

how do I follow this since show no mercy happens as soon as you finish tour of duty?

Getting banished in Step Three seems to prevent 'Underground Undercover' from starting.

Orin Crest Yea...it doesn't say that you need to complete Road to Freedom but it's implied when he says not to finish Tradecraft (which comes afterward), though that's something you wouldn't be expected to know on your first playthrough.

Good news, I figured out how to stay friends with the Brotherhood, turns out you just need to pop one into the head of Father the second you meet him.