Is It Possible To Teach Yourself How To Tumble?

I really want to take tumbling classes, but where I love they are super expensive. I want to learn to tumble because i want to try out for cheer in high school(in about a year). Since i'm taking volleyball lessons, I can't afford tumbling/gymnastics lessons. Is it possible to learn things from just watching videos and going to open gyms? if you have any advice for someone on a budget it would be much help. Btw i'm

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