I would approach this in a different way.
First I would print it out.
Then I would count the squares across and then down, noting that the picture does not include the first couple of rows.
Next, decide how big you want your squares to be to make the size you want.
Next, I would draw around the larger stars so that I could piece those as a single block.
Then, I would make the fill-in blocks and the outer border rows.
Probably more info than you needed. I really look forward to seeing your finished pieced top.