Easy to assemble.   The toughest part was getting the in ground supports in the ground at the correct distance for arbor to fit onto, but was successful by holding arbor up, placing steel support, and getting it into ground, and using it as a guide for the others.    The arbor looks great, and I can't wait until my Trumpet Vine grows up and around the arbor.  Will be a beautiful entrance to my Hosta Garden!