Hi!! I'm a newbie, and completely frazzled...

Just starting to plan for marrying my fiancée and moving to the UK. I have a beloved small 12yo dog, and I need to get her to the UK with me. I have read the UK gov't info on the PETS scheme, but still feel unclear. As I understand it, the rough steps are:
1) Get dog microchipped.
2) Get dog vaccinated for rabies, with microchip number documented.
3) Get blood drawn to verify rabies titer, with microchip number documented.
4) Vet sends blood to one specific lab for testing.
5) Wait minimum of 6 months before traveling.
6) Get dog treated for tapeworms and ticks 48-24 hrs before check-in at airline.
7) Dog must be transported only on British Airways (from Dulles Airport in Washington, DC, in my case).
If this
is not correct, could some kind, kind soul let me know? If this
is correct, then I need some clarification before I lose my remaining hair! Please help -- I love my dog!!!
At what point is the blood draw done? Immediately after the vaccination?? But wouldn't one have to wait for the vaccination to take effect?? And how does this relate to the 6 months requirement?? It would seem to make sense that the blood should be tested for vaccine effectiveness at the end of the 6 months, just before travel??
Also, in reading past topics, people are mentioning the USDA as if there is more than one lab for testing the blood... Some have mentioned going in person to the lab (I think - if I understood correctly!). I have a copy of EC998 saved on my computer. Is this the form that the vet sends to the lab (USDA?) with the blood? Then the vet also completes the form to indicate rabies titer result, plus the tick/tapeworm treatment, and gives it to me to take with pet to the airport on travel day???
If this seems confused, it reflects my muddled thoughts. Hopefully, someone can give me some guidance, and if I don't understand, I can ask clearer questions.
Thank you to all the angels here who are sharing their experience - I'd be lost without this help!!
Cheer!
Teddy