Exactly you don't need to be the car cleaning Guru to apply this kit,anyone that's into detailing/cleaning there car can do it,l started with applying it to just one panel to familiarise my self wirh it's application and my confidence applying it grew after each panel, will do the same on my next carCrystal Serum is accredited detailed application only as you say (which then gives you the gtechniq quarentee). The difference to light is not so much in the application but the actual cured state. Black cures to a much harder finish which if incorrectly applied can only be sanded off whereas Light can be polished off with a compounding pad/polish combo.
I applied CSL to my wife's car recently and it was relatively straight forward - you just have to be methodical and thourough in application/buffing off the reside/excess.