I have to agree with everyone else, definitely go for it.
I'm currently on a course for counselling skills as part of my Access course. Everyone in the class has said it wasn't what they expected.
Some students who enrolled with the aim of becoming counsellors are now reconsidering, because their preconceived ideas were so wrong.
On the other hand, there are students now considering perusing a career in counselling who hadn't really planned to at the beginning of the course.
Think it's a really good idea to do the introductory course first to get a feel for the subject. Also it's a prerequisite for many of the counselling degrees.
Plus despite having your A? Levels most universities insist on you having some formal study experience in the last three years.
Be warned though, as Peachyclair said the course can be highly emotional. You will be expected to reveal a lot of your own sensitive personal experiences. If you decide to train as a counsellor you will be required to have counselling yourself.
If you have any questions that you think I may be able to answer please let me know
Best of luck and let us know how you get on