One of the biggest barriers to organisational change is a collective unwillingess for people to say no. I’m not in any way suggesting that people should become militant and unhelpful, so let me clarify:
If you are asked to do something, it is in everyone’s interest for you to take a moment to establish whether
a. the request will lead to a consumate benefit;
b. whether you have the right skills, experience; and
c. whether you have the time to complete the task in the required time
You would be amazed at how often the task can be simplified, met in some other better way, even if you remain the best person to complete it.
You will also be very surprised at how often team members are happy to help you out and learn new skills/ gain new experience when you delegate to them. Especially if you take the time to make it clear that you have conducted a, b and c above.
Sure, people like the instant power and satisfaction of someone saying to them “yes, no problem, leave it with me etc.”, but the overall gain of a pause will generate a more sustainable satisfaction and respect for your part in a more efficient, more thoughtful business.