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What mzdagrl said. If you know how to drive stick, then it will be a lot easier for you to pick up riding a bike due to already having learned the concept of a clutch and gear shifting. Otherwise, it may take you a little longer [not that there is anything wrong with that]. Most importantly is that regardless if someone is teaching you or not, take things at your own pace and be patient. Instant gratification is good, but if you want until you're ready for the next step, it will be all the more satisfying.