Don't ever do a job halfway. Always query first, unless an editor specifically requests manuscripts to be sent. The odds that more than one editor will want the same article is slim. It will show in your writing. Every writer gets criticized.
Every writer has work that needs revision.
If you start to find writing to be a chore, rather than a goal, stop for a while. You can always go back to it later. Writing should not only be a career, but should be something you love. Top 25 tips that every writer needs to know before they choose writing as a career. This article covers everything from queries to publishing.