Moving WP – how changes effects old site

I am moving wp site to another domain and hosting for the first time. I found this instructions below and everything seems clear to me. I will back up my database and files. It is important to me not to damage old site, so I wonder if I follow these steps below how can this effect the old site? Because it seems to me that changes are done only on newly created files. But, as I said, I am new in this..

http://ww.wp.xz.cn/support/topic/how-do-i-correctly-move-a-testing-wp-site?replies=10
1.) Export the database on the test version & make a copy of the files
2.) Import the database & upload the copy of the files to the real site
3.) Edit the wp-config to reflect the db connection details
4.) Use the Interconnect/it search & replace tool to change all instances of the original url to the new url

http://interconnectit.com/719/migrating-a-wordpresswpmubuddypress-website/
http://wp.tutsplus.com/tutorials/hosting/migrating-wordpress-across-hosts-servers-and-urls/