The time to start watching how-to videos is when you have the necessary resources and are ready to take action. For example, if you're interested in house renovation, it's important to have a house and a specific room to renovate before watching renovation videos. Similarly, for car repair, you should have a garage and a car to work on. Watching these videos without the required resources is more like entertainment rather than learning. Once you have the necessary resources, you can supplement your learning with YouTube videos, but it's not essential. Experience and trial and error are also effective ways to learn. Instead of trying to master everything, focus on specific aspects of a subject and gain experience while working on it. Additionally, reading books can provide more information. The key is to learn while doing something instead of just watching with the hope of doing it eventually.