Now you can Fold the fabric edges over the template and press. opposite sides then trim, then the other two sides same and trim.
With experience you will have the fabric right side upwards and the edges are ironed so when sewn in place the pinked raw edges are concealed on the inside of the seam. The inside of the garment is as neat as the right side. Dont´t stress for first one if its easier to sew with pinked edges showing on inside of garment.
Use baking parchment or a linen pressing cloth between iron and template to prevent ink / toner transfer from your template. It will last for many garments.
Follow the video for the next part, inserting into the prepared gusset hole.