up to you, but i would go do it. if you're serious, though, the KYB's will only work for a little while. Drifting needs some pretty good suspension considerations. I take it you have GR2's?
http://www.turnfast.com/default.html
Read up on how suspensions work and what you can do to maximize what you got. This is a nice little resource on track driving, but you may want to visit a Barnes & Noble's or some other book store and pick up suspension and driving technique books. They can give you a slight leg up, but will never amount to time in the hot seat.
And just remember this, those guys had to start somewhere too, so they know where you're coming from. Don't try to impress them as you'll only hurt yourself. Take your time and build your skill up