Piecing a quilt top like this represents I guess about 5 hours of continuous picking up pieces, sewing together rows, and pressing seams. Of course it takes much longer when you take into account coffee breaks, and all of the usual domestic chores to keep us all fed and in clean clothes.
When piecing together a quilt top like this I lay out all of the pieces on my design floor. Then, starting with the first row, I carefully pick up the fabric squares in order and sew them together into a row by chain piecing; first in pairs, then sewing the pairs together, etc. I press seams as I go, alternating the direction of the seams for every row.
When all the rows are complete I sew the rows together. Usually first into sets of 2 rows, then sets of 4 rows, etc until the quilt top is complete.
A fairly standard procedure, I suggest.