Welding may not be the hardest to learn, I've read that under ideal circumstances mig welding takes 8 hours, stick welding takes 40 hours, and I don't remember what it was said for tig welding, but the initial cost is very high. Of course the entry costs will be mitigated over years, possibly decades, of building stands so the cost per stand will, at least on paper, go down. The cost of the metal is higher than that of wood of course but you could possibly go to a scrap yard and find scrap metal that will work for you.
Lol ime you can learn to weld in a couple minutes....learning to weld WELL takes years.