Advice from a nurse on finding the cursed gateway to fertility

So I e-mailed Nurse Nina.  I didn't really want to, mainly because I didn't want to admit we'd done such a crummy job of charting so far, and also because, no matter how medically relevant, it's uncomfortable to ask someone whether one's partner has an unusually large vagina.
Nina, however, was a lot more comfortable than I was.  She wrote:

"I think it was very smart of you both to try to compare things by looking for your cervix.  That is a great tip I may share with other couples.

It is possible for someone to have a long vaginal canal.  It is also possible that Heather's uterus tilts at an angle which results in her cervix being difficult to find.  Sometimes putting 1-2 pillows under her hips and having her head lower than her hips helps to get the right angle." 

(I don't know how to copyright that, but don't plagiarize, guys.  The sweet nurse wrote it and it's hers.)

I will admit that, due to some late-evening grocery shopping and a fine dinner, we did not make use of Nurse Nina's advice.  

I'm not proud of it, but it's surprisingly hard to find motivation to get half-undressed and lube up a speculum, spreading out towels and washcloths for follow-up, in preparation for a highly-invasive procedure with entirely undependable results.