I don't think anyone can fail at writing if he reads, reads, reads. You will develop an ear for good writing. You will know if the sentence is well constructed without bothering over conjunctions and participial phrases. Lifting one's work above the ordinary demands immense effort. Writing is easy.
Composition is difficult.
Of course, grammar is important, but it should not be permitted to destroy the first joys of writing. This month's edition of the North Carolina Press, a publication of the state press association contains some rules for good writing. Here are a few, peculiarly, offered. Verbs has to agree with their subjects. Prepositions are not words to end sentences with.