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1st you need a drive or interest. If you like putting things together with your hands or if you are heavily into computers, coding and/or 3D printing then this might especially be for you as the trade is moving more & more into tech. If you just want to sample a class I highly recommend any local public college that might offer a Design101 lab just to see if the coursework pique's your interest. If you are in your teens or early 20's I highly suggest working on an actual construction site for 1-3 years as the best architects understand construction and bring their projects in under budget for their clients. One important aspect to understand in our country about architecture is the amount of stigma the profession received in the 80's, 90's and 00's due to lack of finance, budgeting and knowledge. This resulted in the litigious world we live where the only one who wins in the end is the attorney who ends up with all the fees (not good).
Some of the most successful architects are the ones who develop their own projects, cutting out the client altogether. This saves a great deal of time/money and is especially good for the environment if youre into that sort of thing. If this sounds like something you might want to do then I highly, HIGHLY recommend pairing your architecture studies with a degree in business or MBA. I like to think of math, geometry and physics as the tools while art & design are the passion that drives the use of those tools. The bigger you want to go in architecture, the more you will have to know, especially in urban development where law, sociology and even anthropology can play integral roles while studying different cultures & demographics. In the end love what you do or don't do it at all, life is too short.