If employed by NASA, how difficult is it to transfer to another center?

Question in title - assuming you are a civil servant. I know that to be hired on as a civil servant initially, you need to go through USAjobs or become a contractor first. How does transferring work? Is it common?

Submitted June 21, 2016 at 10:25PM by Abo11518 http://ift.tt/28RGGix