Do you preview your questions first to make sure they sound ok or do you just let it fly and hope for the best?

I proofread, but I don't bother with the preview button. 

I prewiev. My typing is so bad I need to find the 'missing letters' etc. before going public ;-))

Preview.

Otherwise, I never know when my fingers have hit the wrong keys.

I'd preview first.

I've been doing this a long time.  I have a Ph. D. in questionology. 

I know how.  But that does not mean in any sense that my questions are award-worthy.  Not at all.  I just know how to keep the site flowing and going and sometimes that calls for a lot of different TYPES of questions.  I am good at variety.