Watch the Spy Hunter: 2 online guitar lesson by Chris Buono from Guitar Cubed
Guitar Cubed makes a little bit of TrueFire history with it's unique split screen view allowing you to view both Guitars 1& 2's neck view simultaneously. This will serve as a superb learning tool when first hearing these parts as well as coming up with your own. In regards to the latter, when composing multiple parts on guitar, especially when the tones will be similar, it's a good idea to make use of the timbral differences the neck affords you. Meaning, even when you play the same exact note, if it's played on a different string (which is inevitably played on a different part of the neck), it's gonna sound different. And, that's a good thing.