There are many different ways to hem knits that don't necessitate owning a cover stitch machine. You will find many tutorials on those different methods on my Sewing Knits Pinterest Page. But my favorite method for hemming knits is with the Honeycomb Stitch found on my regular sewing machine! So here is a quick tutorial on how to do it!
First, measure and press up the hem allowance. I like to use binding clips to help hold the hem in place as I do this.
Next, unfold the hem and apply a paper backed fusible to the raw edge of the hem. I have tried both the 1/4 inch and 1/2 inch tapes and prefer the 1/4 inch. I find it is easier to manipulate around the curve of the hem and still hug that raw edge.
I also like Steam a Seam Light. I certainly haven't tried all of the paper backed fusibles out there but so far this brand is my preferred one. It does a great job of adhering the edge flat and not allowing the jersey fabric to roll. It also gives a little stability to the fabric as you sew the stitch, and helps to reduce the chance of a wavy hem.
Fold the hem back up and following the manufacturer's directions, fuse the hem in place. (See, no roll!) Then, with the right side of the garment facing up, stitch the hem in place with the Honeycomb Stitch.
This is the Honeycomb Stitch on my Bernina, but most sewing machines have a version of this stitch. The Honeycomb stitch has stretch and zig zags back and forth on the wrong side to cover that raw edge.
Here is the front of the stitch and the finished hem. There is no tunneling as is often the case with twin needles.