There will be setbacks.
There will be critics.
There will be raised hopes that are crushed, and expectations that are never fulfilled.
There will be difficult stretches.
There will be high hurdles.
There will be a lot of waiting. A whole lot.
There will be blows to your pride.
There will be attacks on your person.
There will be rejections, and more rejections, and even more rejections.
There will be people who don't think you can do it.
There will be people who don't think you should be doing it.
There will be hundreds of things that will make you consider quitting.
Don't get bitter.
Get better.
Write more. Improve your craft. Learn the business.
Make success your only option.
Take joy in the good things that happen, and grow stronger from the bad things.
No one likes a whiner.
Everyone loves a winner.
Be a winner.
Get better.