It's a breeze. Using dlvr.it, you can feed your blog to Twitter in a minute or less.
Three steps to start posting RSS to Twitter:
1) Go to dlvr.it and create an acount with your email + password.
2) Select a content source type
3) Once you have this entered, configure your content source and click on Connect Socials.
4) Under the Connect Socials screen, click on the 'Connect New' button.
5) Click on the Twitter icon and authorize dlvr.it to post to your Twitter account.