Having attempted some T-bag folds, and failing dismally, I resigned myself to never using that technique.
Then, Christina opened her website, and presto, the best video ever came from herself and her husband (he did the camera work). Because I had contacted her, telling her exactly which 'folds' I could not understand on her web tutorial, she made the large-folds, step by step. This is such a great educational video, I had no problem learning this technique.