I finally approached this 13-lb monster with my sharpest knife. I used the
long skinny one.

I used the "alternate method" shown in the pdf file in this link:

http://tinyurl.com/cxq8z6

It ought to be called the "common sense method" since you just follow the
seams.

I am roasting the center with an herb rub, slicing it thinly for sandwiches.

http://allrecipes.com/Recipe/Herb-Ru...st/Detail.aspx