If you start practicing with used Sta-setX, you can splice anything.....and whatever method you decide to use, start your learning with some NEW double-braid. Nothing laid too tight, nothing core-dependent, and for-sure nothing that has already carried a strain.
Those things will do nothing but frustrate attempts to learn.
This ^^^^^D Splicer or Toss wands for me. Either way, pulling waaaay better than pushing thru line