I’ve gotta be honest, I was a carpet cleaner for almost 13 years and of all the methods I’ve done (chem dry bonnet cleaning, chem dry hot water extraction, steam cleaning, encap) the method you’re using seems to be bottom of the barrel. (no offense please, thats not what I intend)
Encap is easy. There is no extraction, no need for heavy equipment, yes you have to fill a tank (I would be using a cornelius keg, but you could use pump sprayers) but thats easy enough, no need to worry about protecting adjacent areas just watch where you spray and wipe up excess solution.
Using something like this http://www.steam-brite.com/bridgepoint-hydroforce-brush-encapsulation-machine-mh200-free-shipping-p-12211.html which is super light or a cimex (dont care for the cimex quite as much)