proteas Yes, you can use the part about creating users, because all the previous steps are already implemented in WordOps.
To create a new ftp user :
sudo adduser --home /var/www/yourdomain.tld/htdocs --shell /bin/false --ingroup www-data youruser
then apply the proper permissions on your site :
chmod -R g+rw /var/www/yourdomain.tld/htdocs