While I use a strand of Cat5 to splice Zing-it & Lash-it, you're going to find it very frustrating to use as a first-time noob at splicing. It wouldn't be my first choice since it is none too stiff. It's hard to milk it through but it can be done with Cat5 (don't strip the plastic off the wire). You are better off finding a stiffer wire for learning. You'd be better off learning to splice with a larger diameter rope like 7/64 or 1/8 Amsteel - much easier to work with.
A taper is generally recommended, but I don't use one for my Zing-It adjustable structural ridgeline. The ASR won't be under that much load anyway. However, the taper will make it easier to milk through, especially if you're using a Cat5 strand.
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