Much like Valentine Michael Smith, when you first come to XAF it can be a daunting experience, "how am I ever going to grok all this?", you may ask yourself. I asked myself the same question not long ago when I joined the company (predominately to evangelise about XAF). Luckily there are some great resources on the DX site to help you get started. There is documentation on XAF here and on XPO here. There are also some great video tutorials here.
Also, you can follow a short series of blog posts I'll be doing (this being the first) where I chart my journey aong the road to "groking" the framework. So, if you want some company, we can be strangers in a strange land together. :-)