I'd buy alternatives myself.
As stated the Sonus stuff you probably wont use, the cloths you will, Klasse you will, clay you will, R222 wax is not very durable so you'll wise you hadnt used it etc etc!
To start try a basic wash, clay and cleanse routine then top off with the SRP you mention and see how you find it all. You may hate the whole process or you may end up loving it.
Typically I'd say 1st attempt you'll not get a lot of change out of 7hrs!
Between me 1st starting and present day my average times per car have reduced by 3hrs

but that is interior and exterior.