I mark lines for this quilt top (and many of my smaller quilts) at 1/4" and another at 1/2". I've marked them in soap here so that they'll show up.
Now I turn the cut edge of the front fabric along the 1/4" line BUT I don't fold it over the batting because I find it very difficult to get a straight edge. The batting may extend out a bit but don't be concerned with that. I put a few pins in and I baste the folded edge to the batting. It sounds a bit labor intense but it goes quickly with a little practice. The picture below shows what it looks like after it has been folded and basted.
Now the back is folded in against itself (not over the batting) and the edge is stitched together. I try to make sure that a very narrow edge of the front fabric show on the back. I always stitch from the back of the quilt. Any batting that sticks up is pushed down with the needle as I go. On this quilt I used a wool batting so I've been careful not to leave strands of fiber sticking out anywhere which seems to contribute to bearding. When it comes to the corners, fold them carefully and use pins as needed. I often take small stitches on top of another stitch to sort of lock the tension so I can keep the stitches snug. The last tip is to keep the tension pulled up on the thread as you stitch the edge. It shouldn't be tight but snug (if there is such a term for hand sewing tension) because by gently pulling up the edge as it is stitched helps the finished quilt to lay flat.
I'll post the quilt when it's fully finished and has been washed and laid out. It'll be interesting to see how it turns out.