EDIT (21-JAN-2019): I just ran my first three bosses in heroic Uldir yesterday. Obviously I had a lot to learn, but my DPS was competitive still even though my overall rating was not: https://www.warcraftlogs.com/character/us/shattered-hand/sethadon?mode=detailed&zone=19#partition=2&difficulty=4
I recently ran my first LFR (lol) – I just can’t find the time to play much these days. Anyway, I posted what I had here: https://www.warcraftlogs.com/character/id/6118223?zone=19&mode=detailed#difficulty=1
If you build it, they will come.