Practice with new line - not old stuff - which can be nearly impossible to splice. For some of the smaller line sizes used on cats most of the fids in a splicing kit are useless. I'd buy a small one with a hollow cavity in the back and a pusher tool. The pusher tool can be used as a fid on really skinny lines - just insert it through the middle of the outer piece of line and tape the bit that will be the inner piece to the tip and pull it back through.

I was taught by a pro rigger who used drill bits, the guts of ball point pens or about anything else that came to hand. I guess the Toss wand might offer a slight time saving for some jobs.

Chris.