I tried the quick and easy route by just getting the rss.xml file from my HubSpot blog, and than importing that through a WordPress Plugin WP All Import. It gets all the titles and some pictures but a lot of content is missing from each post.
I also exported all the html of each blog post off of hubspot, but hubspot doesn't offer any guidance as to how to map that over to WordPress posts. it seems like the process is really complicated if you want to get everything.