yes you can swap DVD drives, but not with THAT tutorial. It doesn't matter if you have a softmodded or hardmodded or virgin box it will work, but let me check for the right tutorial (and you cant use just any dvd drive)
i couldnt find where it was after a quick search
but my suggestion to you is
Get a lensAnd
follow this guideabout a 15 dollar replacement, and guaranteed to work completely
(but first try cleaning the lens on your dvd drive

)