I am particular about straight lines, and burlap can be a little pesky, so a few years ago I found and incredible tutorial by Craftaholics Anonymous on cutting burlap straight and use it each time I work with burlap! It is a major time saver!
Iron your burlap! This will make hemming a lot easier!
Next, decide if you will sew the hems or use a no-sew method! Unfortunately, I was a very bad blogger and did not take photos of this part! For a sewing method, you will press your seam allowance over and then fold under and press again. Then simply stitch with sewing machine. The Thrifty Abode shows you a very similar method. If you prefer a no-sew method, simply press down your seam allowance and then apply therma-bond,steam-a-seam,stitch witchery, or other product as per manufacturers instructions! Under The Table and Dreaming has a fabulous tutorial on this method using a different fabric.
Here are close ups of my seams…