Sure! I didn't know what I was doing really. I just bought a dog playpen like this one and used wirecutters to cut fencing the length of each side of my balcony. Then I just bought a bunch of cheap zipties to secure the fence. I didn't use any magic, just kept using zipties until the fence couldn't be moved!
You can see my bird netting there and some rings attaching it. That's one part I want to improve but I'm not sure how. I would put the netting much higher, but I have a busy hummingbird feeder up above that kitty loves that I want to keep open. Weirdly and adorably they have a cute friendship with the hummingbirds that show up every day.