It is brought on Niddah 30b that Rabbi Simlai gave the following description about a fetus in the womb: And once it comes out to the world, what is sealed opens and what is open is sealed, for were that not so, it would be impossible to live even one moment. End quote.

And what the Meor Eynayim said about Parshas Pekudei is also relevant to vaginal dilation: By way of a parable, a king who has wise children who can run the kingdom gets greater pleasure than a king who has to run the kingdom himself. And we are called children of the Place. And this Good only comes to the world through the path of Yisrael [Yevamot 63b]. Meaning that we make a path to bring down the flow to the world… And so the essence of the blessed Holy Name’s purpose in creating Yisrael is that each individual of Yisrael should be a moving temple for the blessed Holy Name, as it is written, “And make me a temple and I shall dwell within you, within it is not written…” And “I shall dwell within the children of Yisrael, the Temple of Hashem, they are the Temple of Hashem!” End quote.

And what the Meor Eynayim said on Vayikra is also relevant to vaginal dilation: As a parable, one who has always been in a dark place and has never seen light—if they brought that person suddenly out into the world, they would not be able to tolerate the light. So it is necessary to show them gradually: at first they make a small crack to see a little bit of light, and then they expand the crack until it becomes a window, and after that they bring the person out into the world and show them the light. End quote.

With these verses, meditate on opening the gates of Heaven as you dilate.

Open for me the gates of justice—
I will come through them and thank G-d!
This is the passageway to Hashem;
the righteous pass through it! (Psalms 118:19-20)

And Ze said, Rub, rub! Clear the way!
Remove all obstacles from the path of my people! (Isaiah 57:14)

Expand the space of your tent,
stretch out the tarps of your dwellings—
do not hold back,
spread out your ropes
and be strong with your pegs!
For right and left you shall spread out…
Because your lover is your maker—
zir Name is Hashem of myriads,
and your redeemer is the holy One of Yisrael,
who is called the god of all the land! (Isaiah 54:2-5)

I am Hashem your G-d who brings you out of Egypt—
spread open your mouth and I will fill it! (Psalms 81:11)

My Master, open my lips,
and my mouth will declare Your praise! (Psalms 51:17)

And then insert the dilator. Afterwards, if you want to, say:

I have arisen to open for my lover,
and my hands are dripping myrrh,
my fingers spilling myrrh on the handle of the lock. (Song of Songs 5:5)

If the process of dilating releases any blood, say the following verses to calm yourself:

And I passed over you and saw you kicking in your blood,
and I said to you, Live in your blood!
I told you to live in your blood!
I made you as diverse as the sprouts of the field.
So you grew and matured
and arrived decked out in jewelry;
your breasts were formed,
and your hair was growing,
and you were consciously naked. (Ezekiel 16:6-7)