It will be helpful to use a seam guide. I use Command Strips but you can use painters tape, mole skin or paper. I make my seam guide to go across the whole width of my machine throat. I use a 1/4" foot. Be careful to not veer the end of the seam to one side. That causes a lot of fitting problems later. Sew very slow. I piece slow enough I can count the stitches as I go. I went to an expensive precision piecing workshop for making show quality quilts and the main point was to sew SLOW, never be able to see the underneath fabric peeking out and backstitch at start and stopping even when chain piecing.