Assemble on a hard, flat surface. Once assembled, you can easily move the house to the location desired.
Sort the parts in sequence. We know you are eager to dive in, but spending a moment lay out the parts by ascending numbers will save you time and frustration later on.
Note the difference of the panel edges. For all wall, roof and floor panels, one edge has lip, the other edge has groove. During assembly, the grooved edge is always facing downward (except for the floor panels).
Note the difference of the two sides of panels. As a general rule, the flat side is facing the house, and the washed side is facing outside.