First off, it doesn't much matter whether you scan a print or a neg,
except that you will get the best possible scan from the original
negative on a high-end service bureau drum scanner (Cost around $20 to
$30). You will want to work with your image as a positive (so if you
scan as a negative, simply start by inverting the image), then ask for
output as a negative when you have it printed. However, before you get
too far into Burkholder's approach, go directly to this URL:
http://www.bostick-sullivan.com/davetech.htm
Download David Fokos' excellent article on making digital negatives.
Also download the associated photoshop files. David's method is simpler
than Burkholder's and gives much nicer results, in my experience.
Good luck!
Kerik Kouklis
ps If you really want Burkholder's book, try www.photoeye.com.