I've always found pex plumbing to be confusing. Crimps, clamps, go/no go gauges, expensive tools, plastic fittings and brass fittings, more adapters than you can shake a stick at, and no-tool connection methods (like Sharkbites). But, while I like to fix things myself, without pex issues I've never had to figure out any of it.
Recently, I scraped a pex pipe in my trailer while using a drill. No hole in the pipe and no leak, but the pipe was scarred by the bit, and it made me uneasy. I could ask my dealer to look at it and fix it; they charge $100 per hour. So I could pay them $50 to $100 to make the repair, or use that money to buy the tools and supplies to fix it myself.
I found out that pex is easy --- if you can get to the problem. I bought this tool http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053
from Home Depot and an assortment of plastic tees, couplings, ells, plugs, stainless steel pex clamps, and 10 feet of pex tubing for less than what my dealer would probably have charged me. Now I can fix the problem I caused, as well as have the tools and materials I need in case something happens when we are camping; all the tools and material occupy very little territory.
All you have to do is to cut the pex tubing evenly, slip a clamp over the pipe, slip the pipe over the barbed fitting, position the clamp 1/8" to 1/4" from the end of the tubing, and tighten the clamp with the tool. It's easy and quick.
Here's a link to lots of pex information: http://www.pexinfo.com/