My 13 year old son put it together by himself, not hard. Use a electric drill not a screwdriver. lay out all parts and study directions first. Directions could be more detailed.  We watched u-tube video on assembly of this prior to assembly. My kids 9, 6 and 3 years ride it over and over for hours at a time. Good quality, I keep it outside all summer and in the garage for the winter. Do not plan on taking it apart once together. Would like if they sold the car separate so we could buy another.