Does It hurt ? Acupuncture needles are solid and very very fine
(Approx .2 of a mm) and thus feel nothing like a doctors hollow injection needle.  You will usually not feel the needle go in at all.  What you will feel is a mild dull sensation as the needle touches the energy of the point.
Questions about treatment
Are the needles left in ? In Classical Five Element Acupuncture most of the time the needles are inserted and then removed immediately.
Are the needles sterile ?  Yes. Since the early 1990s very good quality disposable needles have become very affordable.  All acupuncturists will use brand new needles opened from individual sterile packages every treatment.
How much is a treatment ? Again this varies between countries and districts.  As a rough guide, a normal treatment would be the equivalent to 60 € for Europe and 90 Australian or US Dollars. The first diagnosis treatment may be a little more.
How do I know if my acupuncturist is well trained?

The best way is to inquire about what professional association they belong to.  These associations like the British Acupuncture Council or the Australian Traditional Medicine Association have very stringent qualifications and codes of conduct that the practitioner and the college that they trained at must adhere to. Some of these associations are listed on links page.
How many treatment will I need ?  This varies between patients and the severity of the condition. Generally it is good to see a patient once a week for 3 or 4 weeks. Then between the patient and practitioner decide how often it would be best for them to come for the best outcome.
How long are treatments ? Treatments are between 45 mins. and 1 Hour long.  The first treatment may be up to 1.5 hours. In this time the acupuncturist will take a full history spend time getting to know you and give you time to ask questions you may have.