Assembling blocks into tops is not my favorite task but I try to make it as painless as possible. Many quilts I assemble into sections rather than rows but for this one - rows will work best.
I work with one row at a time, stacking up the blocks in order with a pin in the top block to help me keep things in order.
Once the row is sewn, I iron odd rows toward the pin and even rows away from the pin. I find it easier to iron seams *up* so rather than laying the row across the ironing board...I either start with pin up (odd rows) or pin down (even rows) and then I can always iron the seams up.
To keep from having a bunch of long seams to sew toward the end of my piecing....I assemble two rows and then sew them together... here after sewing rows 3 & 4 together, I'll sew 1&2 to rows 3&4 before going on.
There's not any pinning when making these blocks or sewing them into rows but once I start assembling the rows I do pin...please note that the intersection is where the red/blue strips come together NOT the one above! Even I would take out that and redo it.
And guess what came a day early?? It was scheduled to arrive tomorrow but I won't open the box until this top is assembled so I better get back to work.