Learning Pull Routes in Mythic+?

Does anyone have some good sources for learning what to, and what not to pull in mythic+ dungeons? As a tank starting to push further into mythic+, some of the dungeons I just do not know well at all (CoS, VoW, etc) - and trying to learn them on the fly while group is dependant on you to keep the train moving can be pretty intense. Recently did a nelth+4, we made it to last boss with time left, but ended up being short a few % with no mobs left down there to push us over. =(Or the opposite is true, in places like DHT, where we somehow hit 100% with 2 bosses left. Learning what can be skipped seems pretty big deal.I've watched some twitch streamers, and got an idea of what routes they run/pull for the higher mythic levels, which helps - but would like to know if there is a site out there or sources that would make this process easier?