Finally! Someone gets it! Thank you, Phoca Gallery, for delivering an complicated, lean photo gallery with just enough bells and whistles to keep things interesting without crossing over into the "only a php geek would know what to do with 99% of these options."
Oh, as for installation...I'll repeat what everyone else below me has said...go by the documented instructions and you'll be just fine. It might seem a little intimidating for newbies to amend one or two lines of code, per the instructions, but trust me, it's easy as pie and definitely worth it for this outstanding non-commercial gallery.