It's really not hard to install... however I do wish it came with a faucet adaptor... I drilled it right into the cold water line. Gonna be tough when I move!!!
Otherwise, just think out where you want to install the thing...it sure is huge... and prepare yourself for water on demand...
I suggest getting a couple 7 gallon jugs from WalMart. I learned that if I place that in the sink when refilling, as it fills so quick, when I forget about it and it overflows, it just runs into the sink, rather than the floor! Oh, the joy of trial and error!
I feel so liberated from the clean water racket. I've already paid for it in just 4 months (I have 3 tanks) compared to store bought water.
Enjoy