Things that seem to take 4 seconds don't usually. Perhaps I am fussing, and perhaps my scissors are too big. I suspect that might be the case. Sharp, smaller scissors are probably in order.
You're right about that; I originally said 2 seconds, but went back and edited that to 4 seconds after I'd done some loading and roughly timed it. I'm sure I might take 6 seconds if I'm being very careful, but this seems to be about my norm.
I recall that I used to be unhappy with my leaders and considered using one of the plastic guides that showed up occasionally with bulk loaders, but I think all the ones I've had are for the old style long leaders.
I think what finally fixed it for me was just having the goal clear in my head. How far up to start the straight parallel cut, how long to make that, not rushing the curved cut, and carefully aiming between holes. I also find that a shorter leader is quicker and easier to cut and is what I prefer for loading.
I think the most important thing for scissors is being sharp. Nail scissors would work fine and make the curves easier, but would slow me down a lot. I like the nice ergonomic grips on the Fiskars, but think I medium length blade would be a bit better for this use, but these are my all purpose darkroom scissors that cut my paper test strips, my negatives, etc., so a good compromise to me.
BTW. I load in the darkroom so that I don't chance losing part of a frame if I shoot to the very end. I started using Lloyds loaders because they expose less of the tail, but continue to use them because they are quicker and easier for me (especially in the dark). I was guilt tripped into the Watson style decades ago, but eventually went back, and have never had a problem from the felt light trap on any of my 5 loaders - mostly bought used from various sources.
I think Leica had a nice metal leader template, but I've never seen it. Tom A could probably tell you about it, though I don't think he uses one. Tom's leaders look very much like mine. Mine might be a hole shorter (I don't count), and my curves might be more rounded on the ends, but very, very similar. A sewing supply shop would be an excellent place to shop for scissors. They should have good scissors and know what would work well for the type of cut.