Only online as far as I know. They come in a simple envelope and the instructions to apply them are on the site. They are general instructions that cover all the different kinds of skins they sell. Considering the process is the same for all of them, it doesn't really matter that they have a generic set of instructions.
And yeah the skins do collect dust around the edges...but a good wipe with a cloth will get most of it.
Honestly...I would not buy a case expecting it to protect the phone more than just the phone by itself (except from scratches and scuffs)...most of the cases aren't seriously designed around protecting the phone from drops. Expect to pay a lot more for a case that is seriously designed to protect the phone. From what I've seen for serious falls it's usually just a matter of where it hits...if it hits in the wrong spot your phone is toast...just like the pcmag tests without any protection. They beat that thing to death and it only failed after several high drops onto asphalt. The phone is already designed to take abuse...the most I would expect from any case is protection from scratches and scuffs.
I bought my contour flick with that in mind. It's main purpose was to offer the scratch protection that the BSE skin offers...but do it in a way that restores the sleek finish to the back of the phone. The phone feels so much nicer without that BSE skin on it...and the flick restores that feel.