I'm on my seventh book and have done 90% of the fates solo, although as a PLD you can stay alive against a NM fate but you may time out before killing it due to low dips. What I have done (especially for four winds fate) is when the fate pops I just shout "atma book fate please assist <pos>" and every single time others have shown up to help. Contrary to what some think about the in game community there are many people out there willing to help. I would encourage you to shout for help when needed, I'm sure several people will chip in and help. Best of luck to you.