theory11 — Magic Tricks & the World's Finest Playing Cards
There have been a couple of threads about this so do a search for more detailed information.
But in general, the most recommended have been the two Xtreme Beginnerz DVDs. There are more difficult DVDs out there from which it is not impossible altogether to learn from - but by starting with the easiest you'll save yourself months of extra practice, literally.
Another good and more comprehensive sources would be Jerry Cestkowski's book (!) The Encyclopedia of Playing Card Flourishes. Don't been put off by the fact that it's a book, though. The thing literally covers everything imaginable.
Trilogy and Dangerous in my opinion would fit into the "more difficult, not impossible but would take a lot longer to learn from" category I mentioned earlier.
In other words, I know of people who started out with them, and did learn them, but they did so with great difficulty, on average months more practice in terms of learning curve with the material, and there are far less who succeeded well compared with those who started off with easier material. So, I don't know if it's too hard - but it would probably be very hard to say the least.