One of the challenges in delegating to others is the need to get past the 'I'll do it myself' syndrome. Sure, sometimes it feels like it's just faster and easier to take care of it yourself, but it can quickly become a habit, resulting in a lot of your time being wasted engaging in tasks that others could do for you.
Spending the time up front showing someone how to take care of a task for you may cost you more time initially than if you just did it yourself, but it will save you in the long run, allowing you more time to focus on the activities where you cant ruly add value. If you are looking to advance your skills, value and position identifying which tasks you engage in repeatedly that could be delgated or automated is key. Just because you can do it doesn't mean you should!