Bob and Phill,
Thanks for your quick replies. Just as I figured, the installation of a decoder in a Berkshire is completely out of my league, considering it requires the complete disassembly of a steam locomotive. Phill, the following warning included in your online installation instructions answered my question very succinctly: "LifeLike's 2-8-4 Berkshire Steam Locomotive is a good looking locomotive and runs well on DC. However, it is one of the most difficult to convert to DCC. Do not attempt this conversion unless you have a great deal of experience in converting steam locomotives to DCC. You must totally disassemble the drive train and gearing to get to the bottom motor brush, which is necessary for connecting the decoder."
Well, the good news is that I just saved myself more than $100.00 by not purchasing (and destroying) a locomotive and decoder. ;D
Thanks again,
Dave