Windy: I suggest you confirm your JP first, as Dec is a popular month and thus, it is more impt to confirm the JP in a way.
I dun realli have a checklist but I did hear from my planner that we have to confirm the guests' list latest 3 months before AD, so as we have sufficient time to react if guests are unable to make it.. Thus, I kinda of confirm my guests' list by June.. will be sending them reminders once we passed the lunar 7th month.
As for the GDL stuffs, as I wanna to keep it realli simply, I will only be getting the items like probably in Nov? Dun fret all, jus focus on the more impt things 1st.. If you are having your ROM ceremony on the same day: Confirm your JP 1st. 2) Confirm the guests list 3) Confirm Wine list if you are getting external vendors. 4) Printing of cards and sending it to the respective guests.
I will be doing 3 march-ins too, with my WG and two EGs.. but I don't have enuff time, I will only be having one hairdo throughout..