wow, spent a goodly amount of time searching and almost all info is for the 'easy' method/in columns. this link is not for tumbling blocks, but is helpful. first, sew each tumbling block to the next along the straight vertical edge. your rows will now look somewhat like the pic on the link page just after the trimmer picture. the follow pics show how to sew the rows together.
http://www.walnutstreetquilts.com/ca.../bauble-along/
Hope this helps.