PEX tubing connections are placed behind/within walls every day in new construction and remodeling. Make sure all stub-outs are supported properly and if the tubing is run through holes drilled in the studs a protective plate is nailed over the hole to prevent drywall screws/nails from penetrating into the PEX. You should be fine.
Not an issue at all. Your concerns are generally unfounded. Of course it is always smart to use the longest run of any kind of pipe that you can as opposed to having all sorts of fittings, but PEX fittings are reliable.
If you don't crimp as you go (if you use that system) when you put the crimp rings on the pipe, slide it down the pipe away from where it will eventually be crimped. That way in a glance you can tell which have been crimped and those that have not.
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