When working with an assistant it can be difficult to learn to delegate. One way to practice is to find a task that they can’t mess up. For example, getting quotes on a print job from a handful of print shops. Let them know that there isn’t anything they can mess up and tell them you want them to handle the process on their own. Give them as much info as they need and ask them to clarify if they have any questions. Then turn them loose on the project and don’t interfere. This is good practice for you and good practice for them. It will teach you both how to work together more efficiently.