I know a few easy steps, Major . . . and, apparently, a radical time to do it

:
Use a good culinary variety. This is Rex.
Everything I read about it before I tried said that it should be done during the fall. I figured that it was so tough on the plants just to get thru winter that trying it in the spring was best.
I wait until there is some new growth - and there is new growth because the rosemary has been in the greenhouse all winter. About 10 weeks ago they were brought up where it could get some sunlight. The weeks spent
cowering on the floor and covered against the cold had past.
Snip about 8 inches off, strip off what is going in the perlite or starter mix (the only time the soilless starter mix is used here), dip in the rooting compound and push into the cell.
The tray goes down on the floor out of the sun for a couple of weeks. Even a month might be needed down there until the cuttings develop some roots. The flat is watered several times. That's all.
After their weeks back in the shade, the starts can go into 4" pots and from there, into 8" pots.
Steve