Hey, totally get the confusion — this process is messy and not always consistent across embassies.
For Ciudad Juárez, yes — it's true that you usually wait for the “appointment letter” email from the embassy before you schedule anything. That letter gives you the green light to:
Fill out the DS-160
Pay the MRV fee
Create your USTravelDocs account
And finally, schedule your interview and medical
Some people try to jump the gun early with the DS-160, but Juárez is one of those embassies that tends to stick to their own flow — so it’s better to wait until your case is marked “Ready” in CEAC and you get that official embassy email.
So no, you’re not crazy — your fiancé is right to be cautious, and honestly your lawyer is kinda giving generic advice that doesn’t always apply embassy-to-embassy.
If you want to be extra sure, you can email the Juárez embassy (they’ve responded for other people) — but if your CEAC status doesn’t say “Ready” yet, they’ll probably just tell you to wait for the email anyway.