system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Ok so how hard is it to become a herald of Galactus?

What are the qualifications that I need to become Galactus' heralds?

Can just anyone do it? Do they have to have a certain skill set? Do I have to sacrifice something?

I will send world upon world to their destruction if it allows me the cosmic power of a herald.
gpt
The first recorded herald, Norin Radd, was just a particularly smart guy who was ballsy enough to fly up to Galactus and suggest the herald arrangement.  Personality didn't matter much because Galactus overwrote his personality when he became the Silver Surfer.  Power didn't matter much either, since Galactus provided the power cosmic, which outstrips pretty much anything else someone could bring to the table.

In later iterations, Galactus keeps looking for heralds with a personality better-suited to searching out inhabited worlds for him to eat.  So far, this has gone poorly, and they either decide they feel some moral qualms after all, or they have *too few* qualms, and go rogue with the power cosmic.

Overall, your best chance of becomming a herald is to be acquainted with the Fantastic Four, but not popular enough to be an A-list, or even B-list recurring character.