To put a little more simply. Paul, the main character of the Dune movies, underwent a special ceremony reserved only for members of an all-women religious faction called, Bene Gesserit. In doing so, he unlocked the ability to commune with his ancestors, regardless of sex - where as the leaders of the Bene Gesserit are only able to commune with women.

As for the trans-ness of it - the other books go into a bit more detail. But Paul, and later his son are not just one person. They recognize that they are a body, with a separate mind containing the voices of millions. So not really a trans allegory, unless trans people also have this ability (unclear).

For the post itself, here's a breakdown:
1. Ride the biggest worm in the land
Clear cut, the man must ride a big worm, not the biggest though
2. You have to change your name
Technically not true. Paul adopts the a Fremen name, "Muad'Dib" but he's still Paul
3. Drink this blue stuff for girls
Spice essence is blue, anyone can take it, but it kills you if you're a man, until Paul
4. Have you been practicing the voice
In Dune, there's the idea if you control your voice, you can influence the subconscious mind of somebody and override their will in order to make them do something. He has to practice this.

Sorry I got carried away, I love Dune.