Ordered this for my small granddaughter who is getting around enough to climb and slide already.  Assembly took a few hours by myself with the only real need  for help coming during the attachement of the roof section on the step end.  There is a video somewhere that I watched before assembling and it was useful.  I used battery powered drill with a clutch setting to put in the screws to keep them from stripping and had no problems.  Do not use a drill unless it has a clutch setting.  Be advised that these are large boxes when delivered.  They were not very heavy but bulky to handle alone.  #sweepstakes