Yeah but not without failures or trial and error. Do you think the Soviets just launched the one rocket they made for that mission and all was well? It was decades upon decades of research, trials, and years of experience that went into their space technology. Failure to launch is a much more common occurrence in rocket science than you’d expect there’s so many variables and criteria that has to go right before a launch is a successful one. It’s not just “I build rocket and it reaches space” that’s a very obtuse way of understanding how they work. It’s the reason there’s weeks to sometimes up to months of delays.