Hi emailswarup,
I do the same thing as mentioned by you, and used to make the changes as suggested by you, until I found that it was easier than that to make changes.
All you need to do is:
Create a standard HTML template
Click on 'Set Default description'
Going forward, in the 'Description Builder', all you need to do is click on design view (next to HTML view) and make the relevant changes on the page itself. You do not need to grapple with the HTML to find out the areas that you need to change.
I hope this is useful!
Cheers,
Sapana