Very nice product, but do yourself three favors.  1) Download the BILT app.  This helps clear up any doubts you have about how things go together.  You still have to pay attention to the details of the instructions!  2) Don't get in a hurry.  Make sure you take the time to make sure the parts are properly aligned before tightening things down.  This will aid in proper fit in subsequent steps. 3) Have plenty of room to lay out the six cartons that this unit comes in.  I was killing myself trying to make sub-assemblies in one side of my garage and digging through boxes while it poured down rain outside.  Also, it's really nice to have help.  It DOES TAKE THREE PEOPLE to install the roof panels.  After some struggles, still Very happy with this piece.