Talk to people who failed at what you want to do. Their stories cost less than repeating their mistakes.

Success stories are unreliable teachers because they are told backwards, with the luck quietly edited into strategy. People who did not make it usually remember the mechanism far more precisely: what ran out, what they misjudged, where the thing actually broke. That account is more detailed and considerably more useful to you.

Find two people who tried what you want and stopped, then ask them properly. Be respectful about it and they are often glad to be asked. Listen for the specific failure point rather than the mood, because the point is what you can plan around.