I'd say it depends... When you start you want to complete something so badly. It was suggested to me to make something 'small' for myself first ( I did a runner first) so you don't sweat too much! Or put yourself off... You might want to start with cheaper material to practice too. Anything new we try..we can't expect perfection. It takes practice. Enjoy the learning and if the join is going to annoy you, try undoing and try again. Us human beings often expect perfection first time. We are all ( mostly) learning and improving. One thing I like is the glue baste rather than pins ( each to their own) I find it holds flatter and so easier to lineup. Or try a pin right on that seam or close to it when sewing together. You will improve fast, don't worry. Your color combo is great and you are not far out! Why not keep going, join up and see how it looks. It is all good practice, beyond all - have fun.