Put supports in early, while plants are small. Adding them later damages roots and branches.
Push a sturdy stake 6–12 inches into the ground a few inches from the stem. Tie the stem to it loosely with soft ties (cloth strips or garden twine) in a figure 8, so the tie can't cut in. Add a tie every foot as it grows.
Set a wire cage over the young plant and push the legs well into the soil. As it grows, tuck branches back inside.
Set it up when you plant, along the back of the garden so it won't shade shorter plants. Guide the first tendrils or vines onto it; they climb on their own after that.
Based on standard guidance from U.S. university extension services, including Cornell, the University of Minnesota and Oregon State.