I understood the part where I can change position of sidebar and content position after reading another topic.
I want to know whether I can add widget instances to sidebars using the CMS > Widgets options and Block Reference. Because I am trying to do it but it is not working. I am not good in XML and it will be difficult for me to add static blocks manually in layout. I intend to add static blocks in sidebar using widget instance, but only using the Magento Admin interface, not by writing XML codes. Is it possible?