I don't think anybody is every completely done learning Photoshop. There is just SO much you can do, and until you "need" to do something, you don't every realize you CAN! I just like playing with menus and trying the tools. When you remove the intimidation factor, it's amazing what you can find to play around with in Photoshop.
This tutorial doesn't require a pen/tablet to create a great extraction:
Also, if you really want to learn to use the pen tool for extractions, this tutorial might interest you:
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Cassie
My Gear: Nikon D300s w/18-200mm VR & 50mm 1.4
Software: Adobe Photoshop CS4, PSE 9, Lightroom 2