Last year I learned that Adobe was dropping their web authoring program GoLive in favor of Dreamweaver. Adobe bought Macromedia for their popular Flash and Dreamweaver programs.
Knowing that GoLive was going to be a thing of the past, I went about learning Dreamweaver. The transition was not as seamless as many would expect. But after studying and practicing, I made the transition.
Now, I've already designed many websites with Dreamweaver, but Dreamweaver is a very deep program and I wanted to take my skills to the next level.
The reason I'm bringing this up is that the more I know how to do, the more profit I will make on a project by not "outsourcing" portions of my assignment to others.
Bottom line... keep as much of an assignment "in-house" as you can and don't rest with your skill levels. There's always something new to learn.