Christopher–
I asked a similar question about a year ago. You can find the thread
online heRe:
I ended up cutting some of my ingot up with a horizontal bandsaw,
and later with a Sawzall. The Sawzall was fairly wasteful (but the
ingot was pretty cheap). Once I had cut up some 3/16" slices, I could
put that slice into a vice and break off smaller pieces with a large
pair of pliers.
Whit