Well such conversions are not always easy straight forward.
My first advice would be not to play around within your main production website. Copy its files and database and experiment with in your own local server.
I haven't attempted such conversion but going from my knowledge you can try below or wait to hear from others who have gone such conversion.
Create a copy of your files and database so you can try following. Do these in your local test server only until everything is working fine.
1. Install a local server and create a 1 and 1 copy of your website by using backup copies.
2. Once j1.5 is running fine try to update to joomla 1.7 and use default j1.7 template to make sure articles etc are working ok.
You can find many tutorials online search for j1.5 to j1.7 in google.
Here is one i find:
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http://www.ostraining.com/blog/joomla/migrating-from-joomla-15-to-joomla-17/
3. Once j1.7 is running fine install world news ii template quickstart in another subfolder for next step.
4. Install World News ii Template only in your updated j1.7 installation and compare module settings and layout settings with second quickstart installation which you have done in previoues step to achieve same look as demo.
5. If all is ok create a second folder in your production domain and copy files and database. Make necessary changes for joomla domain change and path changes so that your updated j1.7 and world news ii template functioning ok in a changed location. Once it is working fine in a subfolder goto next step.
6. Once above is working simply switch over to your main root.
Another way would be going thru sql way.
Do make lots of testing and analysis before trying anything on your live server and make sure to backup your website and database...
See you around.