Ha! You'll be fine - just keep in that head space. I'm sorry I couldn't yind a current support thread for Mamas doing Wi/WO but I'm happy to hang in there with you if that's any help.
I've always followed the following rules when I have had to do Wi/WO:
(1) as normal
(2)Get the 'don't go, I need you mummy' patter from R. My response: No R is time for night nights (or whatever your sleepy phrase is), lay her down and leave shutting the door behind me (she sleeps in the dark with the door closed) ... And let the games begin!!
(3)R will kick off the minute I walk awayn- stand back and assess. Is the cry upset/distress OR temper/frustration. If it's the latter, do not go in. Hold back. There is a difference IMO between upset and angry cries - don't jump in! If it is the former, implement (4)
(4) go in - put back knot bed/ lay down and again say sssh, it time for night nights now - and again leave
(5) again stand back and assess and do not rush in. Only go in if you LO is upset not just angry / frustrated. If you need to go back in, say NOTHiNG - simply put back into bed/lay down and leave
(6) rinse and repeat (5) until he gives in - HE WILL. It may take hours the 1st time, it will take less time gbe 2 nd time and so on until he decides it's just not worth the effort
Top tip: make sure you have something to occupy you waiting on the landing - Phone, book, game - something that can distract you and stop you rushing in/ going in prematurely. You will be there for a whole a be prepared to stay the course and I promise you will crack it - he will relent before you do.
Hth!
Good luck
X