Whenever I want to customize my blogs I always start with Amanda Fazani's Blogger Buster as her instructions are very clear and simple and you don't need a lot of tech knowledge to follow them. Amanda has written a Twitter Widget that self installs your Twitter updates into your blog - its really easy and customizable!
Create a Twitter accountOnce it has been added to your blog you can drag it where you want it from within the Layout Page Elements area. Remember to save.
Open this page on Blogger Buster
Scroll about halfway down the page to the heading "Add a Twitter Widget using this Widget Installer"
Enter your Twitter user name into the "Create Your Stylized Twitter Widget" box.
Click "Add to Blog"
If you want to add a link such as "Follow Me on Twitter" you can just open it by clicking on edit, and then just copy and paste the following at the bottom of the text code:
[a href=http://twitter.com/USERNAME" target="0">Follow Me on TwitterReplace]
USERNAME with your Twitter user name.If you want to remove the picture that comes with the widget then open the widget as above and delete the following from the code:
Change the  brackets on each end to < > (respectively).
style="background: url(http://bloggerbuster.com/images/twitter-icon.gif)Then click save. Happy Twittering and don't forget to sign up and follow MandM!
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Cross Posted at Coping in a Technological World