Happy to help. 
This is the method to which you are accustomed. It requires manual interaction (creation of dns txt records) every time a certificate is created/renewed. I highly recommend that you start here and successfully get a certificate before proceeding to use #7 (acme-dns).
This method delegates the dns txt challenges to a different domain in order to automate renewals. It's a bit more complicated initially, but it makes renewals cake. It basically involves creating the following CNAME records and a few other steps:
_acme-challenge.mail.dhavenaar.nl
_acme-challenge.autodiscover.dhavenaar.nl
Some resources:
Fortunately for you my friend, I recently walked in the path of automating wildcard certificates with another gentleman who generously documented his process: