Motivating Yourself

To motivate yourself, you must examine and understand your needs, so that you know what you find valuable and rewarding. Then, by changing your environment and perspective, you can find the intrinsic and extrinsic motivation to complete those undesirable tasks. So, rather than relying on other factors to make a task more rewarding, you make it more rewarding yourself.
Here are some tactics that you can use motivate yourself:

Change your attitude and approach to undesirable tasks - For example, the task of reorganizing your filing cabinet may not be motivating in itself. But being seen as a competent and organized person might provide intrinsic motivation for you. By thinking of filing in this way, for example, you can connect completing the task with meeting your needs.
Think about why you do what you do - Sometimes you may start to think that your job is pointless, so why bother to do things? A great way to increase self-motivation is to list all of the positive outcomes of your job. If you're on the cleaning staff in a hospital, ultimately your job keeps patients safe from germs and disease. If you sell office equipment, you're helping people to work more efficiently.
Break your tasks down into smaller pieces - Organizing the entire filing cabinet may be too large a task to do all at once. Start alphabetically, or with the first section of files. Then, when you complete the first group, you can use your success with the smaller tasks to motivate you to finish.
Build in accountability - Tell you colleagues or manager about your task. It can help to motivate you if you know that someone else is expecting you to complete the task.
Master time management - Learn to take control of your time, and create a schedule that helps you to do things more efficiently.

Motivation is a complex subject, and motivating yourself can be difficult. By examining your needs, you can often change the way you view a task, and you can link completing it with something that's intrinsically satisfying. You can also provide your own rewards, and change how you approach undesirable tasks to provide more extrinsic motivation.

By using a combination of self-motivation tactics, you'll motivate yourself to get those undesirable tasks done. Then you can get on with the parts of your job that you really enjoy!