You can learn a lot by practising fillets, and by brazing 4130 rings onto 4130 tubes, or just buy the practice lugs from Rivendal or Sachs and have at it.
I would get the Paternek video over the book, you can rent it from online sources.
There is an element of Paternek poison out there which is that while his videos show the small shop and machinist's approach to building frames, if you are an amateur who wants to make a few top quality frames, his methods are still overkill. This doesn't stop you from learning tons from the videos and books, they are great for that, but I have been around tons of crafts, including motorcycles and aircraft which are very similar, and bike guys make heavy sleding of the least detail of building. Do what you need to to make a profit in a production shop, but there isn't a hillbilly tech way of doing anything, or it tends to be sneared at. If anyone could have done that Paternek is the one, he is very comon sense, but then why should he dumb down what he has to teach, it's just that the effect it that people think they need a prototyping shop to nail two tubes together. Read around on the net and ask lots of questions.