I just installed Atahualpa 3.7.7 and before reading this thread upgraded to WP3.4. I see my version of Atahualpa but that's where my savvy ends.
I see the 2 posts I've done as this is a very new blog. I haven't even begun to size my own header to upload as I have no idea how to change the layout to 2 columns. Narrower sidebar on the right.
I have a header size 940 px x 198 px but can resize it. It looks a bit stretched in the re-size for 2011 at 1000px x 288px so I suppose I'd like my Atahualpa theme to be 1000 px wide but not such a tall header.
I was advised by a mod in WP.org forums to get this theme instead of 2011 because my table with background images wouldn't fit in the sidebar and he/she said that one didn't have to know anything to work with this theme.
btw, my table in the widget sidebar displayed brilliantly in the preview of Atahualpa so I'm already thrilled even if extremely exhausted with a neck ache
I know little to nothing about CSS and am in the styling page in my dashboard totally lost.