Difficulty in using a powerflusher varies. Most units are quite simple to operate. Difficulties usualy vary with accessabilty to pipe work you need to get to. Your type of system and the degree of muck/debris in your system.
When hiring from a reputable outlet the supplier should run you through the machine controls and hire the machine out with a full set of instructions.
Best suggestion pop to the hire shop, with your plumber pal, have a look at the machine and have a chat with the staff. Then decide between you if you feel happy with proceeding.
smudge, November 2008