Or you can just ignore all the advice (including this) and just do it.

I put my first frame together a week after buying the oxy acetylene equipment.

I used stainless steel thin wall tubing, silver rods, non-standard geometry and a mixture of lugs and fillets, every one of which everyone says to avoid for your first frame. I did a few practice joints, they all worked so I just went for it. One howling cockup along the way, all part of the learning experience.