A beautiful knotting job! The knots look consistent and tight and the gimp also looks great!
I recently bought the .8 mm vermeil gimp (the thinnest gauge) from Fire Mountain, and find that the diameter is wide enough to accommodate doubled Pattye's Serafil thread or Beaders Secret thread plus a fine twisted wire needle. This should also work for 20# Power Pro, although I have not tested that yet.
Tucs, no one is clumsier than I am and if I can do it, so can you. It's not intimidating if you lower the risk-- that is, don't try it first with something you care about. Instead, just practice making knots with any old beads or pearls.
String a wire needle with doubled thread (it's easier to learn using Pattye's Serafil or Beader's Secret as the knots glide smoothly into place) and make a bunch of knots. String a pearl, make a knot, string a pearl, make a knot. Make a mini strand just for practice. Say, 15 pearls. You can do this even without a clasp. Just knot, for practice, until you can do it easily. Later you can just cut them apart.
To practice attaching a clasp, try it first without gimp, if you prefer. Thread a wire needle, double the thread, make a big knot, string on 3 pearls leaving a little gap between the knot and the pearls (for ease), pass the needle through the jump ring of the clasp and double back through the end pearl. Pull the thread through the pearl, snugging up the clasp so its right up to the end pearl, then make an overhand knot between the end pearl and the 2nd pearl and tighten it by pulling the doubled thread apart. Then insert the needle through the second pearl and repeat, then the third pearl and repeat, then keep knotting and adding pearls.
When you have 4 pearls left, string them all on without knotting. String on the clasp, double back, snug it up, and commence knotting between the end pearls as you did before.
When you feel brave, try it with gimp.
When nothing important is at stake, it's easier to learn, as it removes the tension in your hands caused by fear of ruining it.
I do this when trying something new with wire, too. I don't want to waste expensive wire so I play around with base metal wire from Michael's, until I figure out how to do it.
