it was real easy. and I was able to watch 3 seasons of That 70's Show.
Season 1:
Tracing the pieces onto Wonder Under and cutting out the pieces (but not on the lines)
Season 2:
iron the pieces onto the appropriate fabrics and start cutting out on the lines
Season 3:
finish cutting out the pieces on the line, then sort the pieces, peel the backing and place and iron.
it was really that easy