If you are a new user of Comsol Multiphysics, there is a nifty way to work through the first example in the book. A pdf version of the first example in Chapter 9 (heat conduction) is available at www.ChemEComp.com. You can download that and put it on the left side of your screen, and then open Comsol and put it on the right. Then just follow along the steps shown in the book, one by one.
Also, I’ve put up an expanded Appendix A, Excel. The second edition assumes that most users have used Excel before, but all haven’t. Thus the pdf version on the web site is an expanded one, like that in the first edition but redone for more modern versions of Excel. So that is a place to start if you are not a whiz with Excel.