I watched THIS video by Reaganite71 on youtube. If you haven't seen his gardening video's, be sure and stop by. You will learn a lot, plus they are very entertaining. I seen this video last Fall I believe, and knew right away I was doing this. Especially after I tried to string up my pole beans and my string sagged so bad in the middle by mid season, I ended up with a $2.60 a 10 foot piece. The corner connections are a good bit higher. They cost me about $3.50 each, and you need two per trellis. You also need a pipe cutter, or a hack saw like I used., and your nylon string. I used mason's string.
Anyway, it didnt take too long. My peas are about 6" tall now, so these short 5' ones are going in that bed. Take a look. Oh..... and excuse the mess. I am working on these trellis's, and my husband is working on replacing gutter and underhang on the garage.