(bump)
1.
I don't think the radicle has to point STRAIGHT down. "Mostly down" is fine. Even "horizontal" is probably pretty OK.
Also, small seeds don't need a hole. Just rough up the surface so it will prop the stem up and root down, then sprinkle some vermiculite on top of it, then mist it.
I'll tap or spritz the seedling to knock it off a fork or spoon onto the surface, or into the hole, semi-randomly, then nudge it with a toothpick or bamboo skewer , or just push soil around it so as to shmoosh it into an approximate "down" direction.
Pushing on the soil instead of the seedling is gentler, and lets shaky hands do delicate work.
2.
To pick a sprouted seed up off a coffee filter, or get a soaking seed out of an ice cube tray cell, add enough water to FLOAT the sprouted seeds. Then scoop under the floating seed with a fine-tine cocktail fork or small measuring spoon. Test whether plastic or metal works better for you.
Then nudge the seed or seedling off the fork or spoon with a toothpick or bamboo skewer, or tap the spoon, or shoot it with a mister or sprayer to knock it off. If it doesn't land root-down, nudge it with the toothpick or add soil and press down in such a way to change the seedling's angle.
I found the cheapest, flimsiest metal fork I could, then cut off one tine and bent the others around to suit my whimsy.
3.
I like coffee filters better than paper towels because they have a smooth hard surface e that root hairs don't penetrate. But if the roots grip the paper, cut the paper, don't rip the root loose.
4.
I try to transplant as SOON after the radicle emerges as I can (checking daily). If you're transplanting from coffee filter to a row olf inserts or prop cells, leave a narrow strip cut from a mini-blind slat, in each row, to remind you how far you've planted in that row if the seedlings are covered.
The lady in that video sure didn't worry about how big the sprouts got before planting!
5.
I avoid damping off and overwatering by mixing rather a lot of shredded bark into my seed-start mix. It drains fast and is always full of air.
6.
I learned indoor seed-starting pretty easily, but for me, "rooting" cuttings always means "rotting" cuttings.