In general do you trust yourself as a person who can find good words and ideas and perceptions?
On a topic of interest to you, can you generate lots of words fairly quickly and freely--not be stuck?
On a topic that doesn't much interest you (perhaps an assigned topic), can you generate lots of words fairly quickly and freely--not be stuck?
All it takes to be a good writer is to have correct spelling and grammar?
Good writing is more than just following the rules?
Is your conception of good writing limiting in any way?