Yes, shielding Xtz can be done in the wallet. Airgap has a step-by-step guide to help you through the process of converting unshielded Tez to shielded Tez. This guide includes instructions on how to create a new shielded address, transfer your unshielded Tez to the shielded address, and securely store your shielded Tez. Following these steps will ensure that your Xtz is safe and secure. Additionally, Airgap provides support for those who need help with the process.