There are several ways to do PEX.
The first and the best requires a $250 tool and a watching a 1\2 hr video to be certified to use it. It stretches a connection, holding it open for you to insert pipe then it releases it.
the Next is the type the home depot sells using a copper ring that is crushed around the pipe and joint to make a seal. If done wrong it can work it's way loose if not done right, as a Plumber showed me. the tool is 99 + bucks.
Third is Shark Bite which is pushed into the pipe and becomes the joints. a lot more expensive. but works, I have heard some tails of leaking but not enough to scare me off. you need to make sure there are no burs. You can connect copper, PEX and cpvc.
Also do not expose it to the sun it will void the warrantee.
http://www.ppfahome.org/pex/faqpex.html
is might be a place that sells it but it has good info.