Woody:
The first bent was lifted using block and tackle hanging from a pair of "shear legs". These can be seen in the first few photos on the school's barn photos web site.
Shear legs are a pair of very long logs attached to each other to make a giant "A" frame and placed into the ground a couple of feet and tied back to a huge anchor in the ground.
After the first bent was up, then this bent was used as the "gin pole" to pull the second one up. The first bent was anchored to the shear legs and then to the ground anchor. After the crane arrived the "shear legs" were moved out of the way after the last bent was up. You can see some photos of the students taking the shear legs apart. You can see this in the photos on the schools site. Have a look and I'm sure you'll understand how it worked. If not, I'll try and help more. Jim
PS. Bibbyman, the upper section of siding, which was to be added later will be stepped out the thickness of the bottom section of siding to create a shadow line. This is a standard method of siding a barn up here in this neck of the woods.
