The 2.0 to 2.2 upgrade is not a minor one. So I'd say no, there's no *easy* way to do it.
First, I'd skip the Metropolis stuff entirely. It only makes things a lot harder in the long run, IMO.
Upgrading is basically a matter of 5 steps:
1. Backup everything.
2. Deactivate the plugins.
3. Upload the new WordPress files.
4. Run the upgrade script.
5. Fix any incompatibilities.
Step 1: You can perform step 1 on GoDaddy using phpMyAdmin. Go to your control panel, go to Databases, go to MySQL, Open the Manager for your database, login, and get into phpMyAdmin. Click Export, select your username, turn on the "Add DROP TABLE" option, click Go. You'll get a text box with this huge amount of text in it. Copy and paste that into a text file somewhere, it contains all the information needed to recreate your database.
Backing up the files is just a matter of using an FTP program to download all the files in the WordPress directory to your own computer somewhere.
Step 2: Deactivate all your plugins. Simple.
Step 3: A lot of people recommend that you delete the old WordPress files from the server before you upload the new ones. I never bother with this, but the fact is that some people have had trouble with this in the past. So, you want to delete everything in wp-admin and wp-includes, as well as all the files in the root *EXCEPT* wp-config.php and .htaccess and anything else there that's not part of WordPress. Also leave wp-content alone. After that, just upload the new copy of WordPress to the directory. It will ask you to overwrite some things (like the akismet plugin), and you should allow it to do so. If you've modified your default or classic themes, you don't want to allow it to overwrite those.
Step 4: Go to your WordPress admin page in a browser. If it needs to run the upgrade script, it will tell you and give you a link to do so. You can run it manually, but it's not necessary, WordPress is capable of detecting when the upgrade script needs to be run.
Step 5: This is the hard step. You may find that some plugins don't work anymore, or that your theme is incompatible. You'll have to upgrade your plugins or fix your theme by hand or what have you. Some things may not work, like the blogroll and such. There are fixes for these on a case by case basis, posting here is probably the easiest way to get answers.
The backup is, of course, the most important bit. With a database backup saved and a backup of all your WordPress files, you can completely restore the website to the point before you started. Just use that big script in phpMyAdmin to restore your database, and reupload all your wordpress files and voila, you're back in business.