I've been following this thread with interest as I had planned to do similar with my first born.
OP - box up your pram to within an inch of its life. Pad the travel bag, take the wheels off if you can and do this 2/3 days before you go so it's not a faff on flight day.
Ask your family to have padding etc ready so you can do the same on the return journey.
Hope to god that your baby will be okay in the sling at the airport.
Are you planning to breastfeed. Again hope to god that that works okay otherwise you'll have to take bottles, ready made stuff - presuming your family will buy a steriliser you.
Have you a car seat for the car journey when you land? Sort that out.
Passport etc that's just a gamble you'll have to take.
You CAN do this. It will be fucking hard and horrible but when you're there, you'll be glad.
Just pack loads of muslins, spare clothes, wipes.
Dummies - even if you don't agree with them - just pretend so that your flight companions can see that you are trying to soothe your baby.
It's all about mindset.
The PP's are just trying to prepare you but you sound very bloody minded in a nice way
Prepare, prepare, prepare.
You can do this, and will live to tell the tale.
Good luck and pay for excess baggage upfront incase you need it.