The cost was quite expensive, I'm not sure the exact amount - at least $45 an hour. Look around in your area, some instructors offer discounts if you get, say, 10 lessons.
It was a really good decision. Not only did having an instructor relieve much of my anxiety (he drove me to the DMV to take the driving test, and went in with me), it gave me the motivation to actually drive.
He told me there are many, many people much older than myself who are leery when it comes to driving, and therefore have put off getting a license. So finding an instructor who deals with the anxious and is understanding shouldn't be too difficult.