It depends on your own level of skill and DIY abilities. We recommend getting a professional plumber to install the Point of Entry systems into your house as these will require turning off the water at the mains. We also suggest getting a plumber to help you install the Under Counter units as special tools are required to fit them into the copper pipes under your sink. The Counter Top units, however, are more straightforward and if you feel up to it, could be done without the assistance of a plumber.