What does he mean by "pull oneself up by one's bootstraps"? Is that an idiom?

Native speaker’s answer
Rebecca
To "pull oneself up by one's bootstraps" is an idiom! It means that you should help yourself, economically or otherwise, without getting help from others by working or finding a solution with the resources you already have. Ex: I managed to pull myself up by my bootstraps and started using my woodworking skills to make some extra money. Ex: It's hard to pull yourself up by your bootstraps if you don't have many skills. Sometimes getting help is necessary.