It's a zipped plugin. Unzip it (and don't change anything) into the Plugins folder in the Sketchup program folder (on windows). Restart SU and activate the toolbar under the View > Toolbars (it will be some "On surface operations" or something.

@unknownuser said: ":35h96pqt]...when I got my phone, that's exactly what I said." Aww,Voder,... ...I don't know whether to laugh or cry Taff

How about some nice Romanesue churches? They may seem to be rather difficult by the first sight but you can start with a simple one and keep adding things to it (like it was actually being done hundreds of years ago).