So far, I have spent about 6 hours (sporadically over the past 3 years) trying to set up a way to do this, yet ultimately it didn’t ever work at all. And every time I end up using some online third party service just to get it over with.
I did it on Windows once and the setup was a simple 5 step wizard. After which digitally signing a document just works with a couple of clicks.
Bonus round:
on Linux there is only one PDF viewer that implements tripple click for selecting a whole line AND can invert the colors of the document (which helps some partially blind users). That viewer is Atril and it has no way of even attempting to digitally sign a PDF. As soon as you want to do the signing, you lose those one of the two features and people with impairments can’t do their work properly.
the screen readers have voices from the 90s and setting up anything modern with them is above my skill grade - as again, I fucked with it for days and didn’t manage to get a natural sounding voice to work. On Windows it is way simpler, including working well for mixed language documents - for example German text with technical terms in english or latin.