If there is one engine failure on that route then there is a high possibility the second of these defective engines having to operate at very high power setting would also fail before you could reach a diversion airport which would mean a ditching in the remote far southern ocean probably five days from a rescue if it was a survivable water landing.
So the plan would be.
1. Grab my bag from the overhead locker and remove the things which would increase my chances of being one of the rescue survivors.
2. First item to make sure I had a bottle of water. You can get pretty thirsty in the half a day it would take for emergency supplies to be dropped to the southern ocean.
2. Second item would be to put on my jacket as it would be cold if I managed to get in a raft for 5 days.
3. Get my EPIRB take it out of its case and have it in my pocket ready to deploy.
4. Also make sure I have my GPS, mobile phone and the 3 day back-up battery with cables also in my pocket and put the mobile phone in a waterproof bag.
5. Count the rows to forward and aft exits and memorise.
6. Look for potential exit problems in rows between me and the exit rows, bags hand bags, animals etc and and develop a plan as to what to do if it becomes a problem.
7. Be ready and prepared to go to brace position if it looks like we are going down even if the brace instruction is not called.

My guess is that if one of those RR engines failed more than 180 minutes from the nearest airport you are in deep .... and your chances of arriving home in one piece is less than 20% so you better do everything possible to make sure you will be one of the few survivors.