Ha, ha. Fortunately, they do not compete with each other. The H_C is suited/intended only for the home environment and AG is intended for businesses (although it can be used in the home environment too).
It will indeed help a lot, but things do change as time goes on. The guide is probably outdated by a couple years.You have here at malwaretips a detailed guide how to set it up and configure it properly.
You won't get any.Customer service
Just to inform you:Does this product do anything much different than Kaspersky's Trusted Application Mode ?