Assembly took me and my dad about 3 hours. Like drummerben said, the hardest part is the front wheel assembly. At times, we needed my mom to come down and help us out a bit. We took off the black plastic engine cover which exposed part of the frame. Then, we rolled the bike partially off the crate, and with a third person, put a car jack under the frame and jacked it up. Oh yea, this has to be done after handlebars are installed. But anyways, jacking up the bike makes the front wheel go in a lot easier.