It’s pretty straightforward. Here’s a couple of tips.... Remove the presta valve core when attempting to seat the tire, you’ll get lots more air volume that way, and...don’t add sealant until you’ve already seated the tire. Once the beads have seated and everything looks good, remove the pump head from the presta valve (of course all the air will escape). Then add the desired amount of sealant thru the presta (the valve core is still missing at this point). Finally, install the valve core and air it up again to whatever pressure you’ll be running, and slosh the tire around to spread the sealant around.
Then mount the wheel and ride.