No - quite straight forward really but make sure you have a decent cable from alternator to unit and unit to battery for charging currents.
Also - IF you have any alarm or 'door locking' type circuits, remember that the unit works by breaking the earth side of the battery. Therefore, these circuits would require a bypass to maintain power when battery is isolated. Especially important for door locks, otherwise you may be in danger of locking yourself out. /ubbthreads/images/graemlins/blush.gif
One last thing - don't leave the unit energised all the time as it draws an amp or so and will flatten a battery over a weekend.