Subwoofer install

Hi I know this has been spoken about alot and I'm sorry to bring it up again but as good as the install instructions are I just need a little more advice 

I've got the canton system installed on my Octavia 

And like everyone want a bit more bass 

I've purchased a pioneer ts-wx300a active sub

So ignoring all the sound deadening stuff etc 

What will I need to complete a basic but good install 

Do I need the lc2i still 

And what else would I need to complete install before I try to find someone to install for meas I don't want to get an installer to fit then put extra costs on the bits I need to purchase 

Thankyou for your help and advice