First the blow toad cleaner, then the sand flea rake, now this
If snelling a hook wasn't so easy without a tool, I absolutely can't imagine what a tool is going to do to make it easier. The only time my big fat fingers and thumbs have a problem is when I try and snell using 6-8# test mono and not leader material. Everybody has their own method, but I was taught by a charter boat captain over 40 years ago and I have never seen an easier way.
Take the leader material and put one end through teh eye. Pull it until there is about 2" left hanging out and take the end you pulled and place it along the line on the hook. Hold both lines tight and start wrapping from the eye towards the bend. Take the loop tha is left, place it in your mouth so the leader gets nice and wet and start pulling on the 2" section you left hanging. Keep the loop in your mouth as long as you can, and don't release the hook until you snug up the line you are pulling on. Take a pair of pliers and grab the tag end left outside the snell and pull it and the long end from the eye until tight. Snip off the tag, tie a fisherman's knot at the end, attach a swivel, or whatever.
Takes maybe ten seconds, max with 30# or larger leader material. I keep the turns on the hook to 4 with 80# and six with anything lighter. With a little practice, it is one of the easiest and quickest connections to tie.
I've never seen this diagrammed, but if anyone has, I am sure it explains it better than words.
But then again, maybe I am just an old fart.
My worst day fishing was 1000% better than my best day working.