Many believe that installing a pellet stove is easy and almost dull, given that the operation of the equipment itself is very simple. This is not the case. Fire is something to be taken seriously, always.
The lowest risk is to waste time and money, damaging the equipment and voiding the warranty (the warranty is immediately voided if a pellet stove is installed incorrectly). Health and safety risks are far more serious hazards you can incur if you do not contact an expert from the early stages of the project.