I like the manual. Although I prefer to do a clean install of Windows first
(say 50% of the space on the HDD) then do a fresh install of Trisquel in the
remaining space.
This is far less complicated and risky to do. All I do within the Trisquel
installer is to select "Use continuous free space". Then the Trisquel
installer doesn't even touch the Windows partition. It only creates a new
MBR.
This method has always worked for me and produces a dual boot solid as a
rock. Plus I get a fresh Windows install without the OEM crud.