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FredyCro-
Everything needed to build frames can be self taught.
Reading the Paterek Manual and obsessing about geometry and fabrication methods is key.
Next is buying welding or brazing gear and figuring out how to join steel. Then you start joining tubes and thinking about jigs.
The easy way is going to TBA and have them teach you.
Hulsroy
I draw everything in Rhino and print mitre templates on paper and hacksaw and handfile everything to fit.