Re: When is it too soon to leave?
I does look bad to leave in less than a year -- but if you are miserable, sometimes it is the best choice to make anyway. However, I would strongly recommend that you not leave until you have another job lined up. That way, you won't find yourself unemployed and perhaps end up with an awkward gap in your employment history. If you were to quit and then have a little trouble finding a job you really wanted, it could look suspicious to a prospective employer -- particularly if that 2nd job doesn't work out and you don't stay there long. To avoid that problem, have the new job all lined up before you resign so that there is a minimal gap and you can always show that the choice to leave that first choice was yours based on the fact that a better opportunity came along for you.
The fact that there is a nursing shortage in many areas of the country doesn't mean that employers will always overlook the fact that an applicant has been hopping from one job to another frequently. You still need to "tend to the appearance of your resume." In fact, some hospitals have been burned so much by job hoppers that they are getting pickier about hiring (to not waste money on people likely to leave soon) and/or insisting on contracts. You never know when the employment climate may change in your region. So, don't be careless about resume just because conditions at the moment are in your favor. You'll be living with your resume for the rest of your life. Keep it in good order and you'll be well-prepared for whatever the future brings.