If assembling a zipper from a continuous chain, insert the slider head by cutting a small V into the zipper teeth, feeding both sides in, and pulling the slider up.
For visual learners, this video from Lauren's Top Tops shows the standard centered zip method, while this video from Professor Pincushion covers the process of installing a zipper in a seam. To make sure this fits your project, are you: (clothing) or a bag ? lb.zip
Install a zipper foot on your sewing machine to allow stitching close to the teeth. If assembling a zipper from a continuous chain,