I mostly use my pocket knife, as long as it sharp enough for a good clean cut. You don't want any crushing or long slivers on your 45, could cause rot.
Moisture is the key. Temp is important also. Unless one had gone down l try not to spray the leave. I will spray the dome and the plug when needed, something you'll have to get the hang of.
I like big cutting already topped growing several tips.
I use the cheap Walmart rooting powder, works just as well as the jel.
I've rooted straight into dirt, them expanding peat plugs, and them rapid rooters plugs. I like how tight the rapids hold the cuttings.
13 days from cutting