A new word is like a wild animal you have caught. You must learn its ways and break it before you can use it. - H.G. Wells

Beginning writers tend to want to turn to the thesaurus often. There is nothing wrong with new words, but it's usually obvious when a writer depends too heavily on a thesaurus. First of all, too many difficult words are too much for a reader. Keep it simple. Second, no word from the thesaurus should be used if you don't know how to use it in conversation. Misused words is a quick way to the rejection pile.

Don't get hung up on fancy words, and your readers will appreciate it.

Also, have faith in yourself, and develop a thick skin. Take criticism gracefully, use what's useful and discard the rest.

A writer can be forgiven for a lot of things, but never for quitting.