I think you may be better off with their Rubicon Express 2" lift as it comes with brake line brackets and bump stops for similar money and add the disconnects to that. The urban kit doesn't come with discos, it's an optional extra also.
http://www.doubleblackoffroad.com/je...-Lift-Kit.aspx
Suspension on JKs are quite easy to work on. Watch this video to see if you can do it yourself. You will learn a lot and enjoy the experience, this will be valuable to you when you decide to upgrade down the track. Then you can get away with new springs and castor correction only.
Also any mechanic or suspension place in Perth will be able to fit any of these kits for you. DBOR have good after sales if you need help too. SBR is also good to deal with but if you want them to fit it, it's only fair you buy their products.
What are your plans for your JK? Do you just want to add bigger tyres or just lift for looks? Are your funds limited or have a budget?