If asked what my salary expectations are, should I aim high?

No, always research the current salary range for people with your experience, qualifications and for the specific type of job before you go to the interview. If your expectations are too low, it shows that you are either desperate for the job or have no idea what the current market is. If you aim too high, you may not get the job. A safe answer will be to ask what their budget range is for the position and then adapt your answer accordingly.