I don't know that you will find any great difficulty with these Anne.
Sow the seed in a pot of seed compost early in the year and leave it outside. Some seed may germinate the first year but year 2 is more likely. Let them start growing and prick off into individual pots of John Innes compost.
When they get to a reasonable size plant out into a gritty soil in the sun. I would not feed them once they are planted out or they will gbrow rampant and straggley. I don't know that they have any particular problem with pests and diseases.

I have had these for a while and they have been pest free really. one year they had greenfly but other that they are very good doers.

Germination can take place within 24 hours of sowing I have found, even when sown on filter paper in a petrie dish in the 'fridge. D.d Flashing Lights does not always come true from self saved seeds, but the variations one gets are all lovely.

Once you have one . Division is easy, if you sink one you like so that the stems can root that will let you save a chosen best plant for the future.