Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email email@example.com.
Yes, those articles @JKarlsson referenced are excellent resources. I also have a little upgrade service I just recently launched. It’s still an alpha release, but should only take you a few minutes to stage an upgrade if you’d like to give it a shot.
It actually will connect to your server over SSH, copy down the files and DB to my site and perform the upgrade on my site.
JKarlsson, thanks for a good advice! I had updated my store to the newest version with cart2cart. They also have lots of tutorials here http://www.shopping-cart-migration.com/cart2cart-videos Thus with this step by step instructions, everything is pretty clear!