I like your choices of fabrics - and the applique work is lovely.
Have you done some "practice piecing"?
If you can guide your machine that nicely on the applique work, I would think you could learn to guide your machine on seam lines.
However, if you would rather NOT do that, it makes as much sense to have someone else piece it as to have someone else quilt it.
If I understood the narrative in one of Kaffe Fasset's books - he did the designing and someone else did all the piecing.