Unless you are tracking the car, a corner balancing is a waste of time. If you feel confident with a few wrenches, I would try installing it yourself. The problem with adjustable coil overs being installed by someone other than the car owner in my opinion, is that you have countless height adjustment and damping adjustment. Especially with the KW. I installed mine last month and I must say they are ridiculously compliant for coil overs. I still have yet to get an alignment yet because I am still playing around with ride height. I would try to install it yourself, it is very therapeutic and you learn the gist of things.
Tools needed,
Jack stands, low profile jack, 12mm-19mm sockets, spring compressors, breaker bar for sockets, hands willing to get bloody, back willing to get strained, and lots of bottled water....
All tools available from Harbour freight for less than $100.00