WordPress 2.7 upgrade steps with video expalined

Welcome back to Tech18.com,
As you all know WordPress 2.7 is now available and you need to upgrade from your lower version of wordpress to 2.7 version. Many of them are little bit nervous to do this because a small  mistake in upgradation can harm their current blog database. So i thought let me myself give you some steps so that you can upgrade your wordpress blog in safer way.