You can start learning how to manage your Magento store anytime you want. It comes with a lot of features and also includes a steep learning curve. A user guide is also available online for both Magento Enterprise and Community Edition, which can be used to get an idea of its working. Moreover, you can also ask your project manager about getting access to the staging environment, by which you will be able to boost your skills at the time when your website is getting developed. This will also prepare you to take the complete authority of your website from day one of its launch.