I think you are reading too much into the Gallery install. All you need to do is upload Gallery (any version less then 2.0 which is still beta 1.5-RC2 works great), to your server and run the install script, fill out the forms that allow you to customize your install, make sure you add the path to your geeklog install in the field that asks for it, and your good to go.
If your server doesn't have any image libraries then you will have to install one (GD or imagemagick or netPBM which ever you prefer), most commercial servers include imagemagick and or GD, and I believe GD is installed by default with PHP. If you can run Geeklog on your server then more then likely you can run Gallery.
Gallery is much easier to install and integrate with Geeklog, then it is to install Geeklog by itself itself.
Yes I am mental.