That is a horrible piece of advice, i would have never learned how to do transmissions if i didnt just go ahead and start tearing shit apart, same with motor swaps and rebuilding
i say read up as much as you can and when you think you know 90% of it, read everything 2x over, then if something goes wrong take a good look at it and make sure you can do it (right now you cant even hook up a radar so you have alot of work ahead…)