First you need to use your Big Shot and the sandwich for this goes, from bottom up, cutting plate, paper, die, and crease pad. No top cutting plate is needed. Take extra care that your blades in the die are NOT next to the crease pad. And for this die you will need the extended cutting surface. Cut four of the sides, two of the roof and one base.
I think it's helpful to have one of the sides made from a scrap in front of you to remind you (visually) of how the creases or folds go.
First I do the base which is just like making the lid of a box. Four equal sides with small tabs to glue and adhere to the edges. Put aside.
Finally you can finish all four sides then add the roof. I just put a dot of glue on each corner of the top and set the roof in place. The pics below show what I consider to be a "good" base corner and a not so good one.
Now you can decorate to your heart's content. Hope this was helpful in case you want to try it. I wouldn't shy away from it because it gets easier the more you do. And while this came out at Christmas as a holiday luminary, it makes a great Halloween lantern, a spring or easter theme and a patriotic theme as well. I can think of all kinds of occasions it would lend itself to!