(When this is not a concern, of course you can sew strips to two opposite sides of the square then longer strips to the other two sides.)
The center of the star is 6" finished. I wanted my center square to be framed by 1" strips so I cut the center square 4.5" and cut my framing strips 1.5" wide and 5.5" long. You start by sewing the first strip to one side, sewing only part way along - at least 1" but not more than halfway. As you can see, the strip extends past the square.
Fold the first strip back into place and fingerpress about one inch along the seam. I normally press with an iron but find fingerpressing works best for this step. Line up your second strip along the edge of the square and the first framing strip across the partically sewn seam. Sew in place and press.
Add the third and then the fourth strip in the same manner. After the fourth strip is added, you will sew the remaining part of the first seam.
This is when it helps to have finger pressed rather than ironed as you need to fold the piece back down so right sides are together. Sew in place, overlapping the end of the first stitches.
Now you can press in place and the center of your block is done.
Then go make some more!