I screen ProMix thru a 1mm mesh, same as mosquito screen for your windows, then fill up one of those 9-hole seed starter pots. Moisten well then poke a hole in the center of each one at least twice as big as the stem that going to go into it.
I'll take my cuttings so there is at least one node under the surface when planted, scrape the stem a bit to expose the cambian layer, dip into clone gel then clone powder, drop in the hole and use my little pocket knife to pack the mix in tight against the stem and follow that with a few squirts of water to make sure it's nice and moist around the stem.
Into a dome with something like a 23W CFL 6" above them in the bedroom closet and almost always get 100% rooted within 2 weeks depending on the temps in the closet. No heat mat and I've had them root fine with temps as low as 60F. Just takes longer but the lower temps really help prevent stem rot, (damping off). I killed a batch with four of those pots once using a heat mat so never did that again. Was in my early days of learning to clone and I'd be lucky to get one out of 3 then.
This thread reminds me that I'm late to clone my CBD plants and get the mom's into the flower room.