here we go!
10x20 mondo tray with humidity cover (or plastic bowl with saran wrap cover leave a cm gap for gas exchange) cfl or fluoro tube light at 24/0, 20/4, or 18/6. make cut (preferably while submerged in water or even better under running water) and apply rooting hormone, insert cutting into pre-soaked rockwool. a perfect presoak is pH 5.2 1/4 str flowering nutrients or other weak fertilizer, like a 1-1-1 or an organic, although P and K are supposed to help rooting more. ppm should be around 250-300 w/ nutrients and pHing.
put rockwool in tray, pour a little of the soak in the bottom (if you have an irrigated tray bottom, where water is stored in trenches) cover it, keep the light on it, warm spot not too hot not too cold, a heat mat will help but isn't always necessary.
the rockwool should take 3-7 days to dry with water in the bottom of the tray, and usually by the time it dries you will have roots. may need to rewater once and then you'll get roots by the time it dries, but careful to not overwater.
clone will root in 7-10 days, roots will stick out of the rockwool within a few days and then you can transplant and grow a good root mass until flowering.