Sonnex/Tricumulator?? what needed

When I looked at the Sonnex/tricumulator article it looked like when you ordered it you got 3 springs for the 50 bucks. Is this valve sleeve thing included and do you have to do this too? Can a person just do the springs?

I want to do the job once and do it right so if I am missing something please let me know. I hear everyone who has done this mod is extremely happy with the performance. I don't "need" one, but for 50 bucks, why not do it while I am changing the fluid anyway.

Also, this is a job that a normal person can do right??? I have never dug into a transmission before and this makes me a bit nervous. I have read over the directions and it seems pretty straight forward, but if there is anybody saying this is a tough job...please say so!

But back to the point...there is a sleeve AND springs in the kit right?

Thanks!