I wrote about this idea before. I still think it's a clever way to trick yourself into getting things done. I didn't go as far as creating a character for my alter ego. But, it does help to distract yourself from believing you can't do it. If you break it down, what does the task really require, at it's most basic. You can do it if you think of it as just talking (for instance) and don't get caught up in expecting things to be harder than they are. "Fake it until you make it". From CopyBlogger:
This month’s creativity prompt is to invent an alter ego who’s great at the thing you’re not good at. You’re going to imagine this person as a character in a novel or a film. Know what they look like, how they talk, what they wear, where they live. Then, when you’re doing the challenging activity, you’re going to write as that character. You don’t have to be a fiction writer to pull this off. It’s much easier to do in writing than it is to try face to face or on the phone, although those are also options if you feel ready for Expert Mode. Are you too timid when you discuss your services with a client? Write a pitch using the voice of an ultra confident alter ego. Are you too blunt when you email colleagues? Write an email using the voice of a nurturing, benevolent earth mama. You don’t have to share what you write — but you may well find that you want to. When it’s time to be tough, or patient, or steely, or suave, it’s handy to have a well-developed alter ego who can handle those states effortlessly.