Why would you want to leave? Well, if you do decide you want to move from WordPress to Blogger, then it is possible, but only because WordPress is so awesome and kind like that. If you want to go in the other direction, check out this post on moving from Blogger to WordPress.
First up, take a WordPress backup. Do this by FTP (for your theme, images, etc) and also via the WordPress Admin (for authors, posts, etc). Then whatever happens, you at least have a copy of your blog/website which can easily be put back live very easily.
For your FTP access, get Filezilla downloaded and setup for your site; your ftp, user and pw should come in a mail from your hosting company.

Alternatively, your host may have an inbuilt FTP programme in the host admin area – in which just download it to your computer from there.
Take everything in wp-content to be sure. If you have made changes to your theme, added images, etc – all of this will now be safely copied onto your computer.

Keep this backup safe, in case you realise one day how awesome WordPress is, and how crappy Blogger is.
Step 2 for your blog backup is to go to your WP admin panel, click Tools > Export.

Now, to get up and running on Blogger with your old site, the software below is just the ticket. Using your WordPress xml output file, which you shoudl have saved to your computer, you can add 50 posts at a time the old site to Blogger.
To do this, you need to use this: http://fetag.net/?q=node/21 which is the bees knees. And here is the support FAQ forum http://bbs.fetag.net/viewforum.php?f=11.
In short though, it’s very simple; just unzip the latest release, open it up and enter your blogger login, and voila!

Good luck!