To Get is the normal form and would be best for everyday use. However book titles are allowed artistic license. Regarding the to Getting forms, I would think of it this way: 1) The Essential Guide to (doing something) + (which is) Getting Your Book Published and 2) The Guide to (doing something) + (which is) Getting it On In these examples each phrase can stand on its own, but you have follow ...

Understanding the Context

1) Getting messed up = refers to becoming whatever the condition is (in a bad situation) to get messed up or getting messed up=slang that means to be drunk, drugged or having some sort of problem about something. Getting messed up is something I try to avoid. [getting messed up=subject of the sentence. See being messed up below for more grammar.] Here, the verb get means become.

Key Insights

Become is ... A person with a vendetta may be said to be "out to get" someone. And, when they do succeed in getting you, you can say you've been "got". A sustained, repeated attack on someone is sometimes referred to as "getting at" someone, and the subject may say they feel "got at". People: The Essential Guide to Adding Essential Oils in Your Beauty Routine I was over exaggerating while writing something for class and I wrote Welcome to the most wildest show on earth.

Final Thoughts

Someone pointed out the most wildest and I was wondering if it was OK to use most... Since "most of _____" is a prepositional phrase, the correct usage would be "most of whom." The phrase "most of who" should probably never be used. Another way to think about the difference between the subjective/objective pronouns is to revise the sentence to include a personal pronoun and see which form (he/him or she/her or they/them) fit.