Yes, it is safe. It's the default in newer versions of Windows, in fact.
I'd suggest reviewing "Secrets of PowerShell Remoting," which is a free ebook here. It covers various ways to enable Remoting in bulk, including Group Policy and other "recommended" practices. Unfortunately, "all that stuff" tends to be the right way to do it, since that's the way the product is designed to work.
We're probably not going to be a lot of help with a TechNet script, though – you'd want to contact that script's author if you're having problems with it.
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