>> My hands are so clumsy, I often kill tiny seedlings when I prick them out to pot up.
Me, too. Now I try to pull out a scoop of medium with the roots. If I have 1-2 seedlings, I'll pot them together.
If the scoop has 3 or more seedlings, I'll try to encourage the clump to fall apart into smaller clumps, for example by dragging it over a rough surface or parting the seedlings like combing a part into my hair. Or pulling on a shred of bark that sticks out.
Or I'll try to pull or divide a single seedling out of the clump, hoping to pull the clump apart that way, while maybe only killing the one seedling I was working on.
Sometimes I use a cocktail fork, or a bent salad fork with one time cut off. Or a bamboo skewer. Or a paring knife with a very small blade that I have dulled.
I figure that any seedling I've mangled is at risk, so I may plant two singletons in one pot. If so many seedlings sprouted that they are crowded, I probably will need to thin some out eventually.
Some thinning happens accidentally while pricking out.
Some thinning happens when a root is damaged and the potted-up seedling dies.
Some thinning, I have to do deliberately, if TWO potted-up seedlings in same pot both live.
