Yes, once you have the EPUB that you can read in ADE, you can simply import the book into calibre like normal.
See Apprentice Alf's blog for instructions on setting up, it's pretty simple.
Unfortunately, per the forum guidelines (rule #8), we cannot discuss the specifics of DRM removal, beyond pointing toward Alf's blog.
Fortunately, we can tell you where to find his blog, which explains it pretty well.