difficulty level 5/10
but it means cutting at least one custom abutment to check angle before verifying that this new scan body system is correctly digitally positioned. depending how off it is, it may be 4 or 5 more custom abutment mills before you get it right, and that just verifies one variant of one platform.
difficulty 9/10 to find a 3shape user who will convert your files in the 3shape library found on the sirona site to stl.