Prepare your Magento

Refresh and Disable all the Magento cache

cache_management

When configuring your store, whatever theme or anything else you should refresh all the Magento cache and then completely disable it. To get it done go to System -> Cache Management

Reindex magento data
index_management
After making any changes to magento data (products, categories) you should reindex the data. To get it done go to System -> Index Management

Backup Magento files and the store database

It saves lot’s of your time if something goes wrong. To create backup go to System -> Tools -> Backups

Disable compilation mode

To get it done go to System -> Tools -> Compilation

Disable Merge JavaScript and CSS Files

To get it done go to System -> Configuration -> Developer

Log out from Magento admin panel

It must be done to refresh the magento access control system