Kits are very easy to fit. You just need a 25mm hole cutter to drill the hole on the back of your headlamp covers. The hardest part is finding a place to locate the ballasts. I velcro'd and zip tied mines. Have a search and you will find guides/hints how to do it. I'm not the greatest diy person and still managed it easily.

To get the headlamps adjusted I just took the car to my local MOT centre. Was a 2min job and they didnt even charge me!
 
Excatly what I thought mate....if anything did ever go wrong and I needed to use the warranty it wouldn't cost me loads to send back either.