I would like to give a CMS look to some of my pages. I want to customize them by removing the default widgets and adding other widgets as my wish (I will use plugins like My Custom Widget to add custom codes if I need) .
Is there any possibility to customize the specific pages like this?
Take a look at this plugin, WidgetLogic.
From the description:
This plugin gives every widget an extra control field called "Widget logic" that lets you control the pages that the widget will appear on.
I've used it successfully.
The other option that I know of is called Widget Context.
It is slightly more complex than Widget Logic, but it doesn't require the use of any conditional tags, which can be intimidating for non-coders.
You can show/hide widgets on selected pages, posts, archives and more.