Well, forum was fast once. At ticket service they're always fast and accurate. :-)

The following is their reply that solved my doubts.

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You have to test the site prior to change the DNS using hosts method.

If you are using LINUX/Mac OS, enter the IP address and the domain name in '/etc/hosts' file on your local machine as shown below and try loading the domain after clearing your browser cache.

198.20.116.197 domain.com www.domain.com

If you are using WINDOWS, enter the IP address and the domain name in 'C:\WINDOWS\SYSTEM32\DRIVERS\etc\hosts' file and try loading the domain after clearing your browser cache.

Replace domain.com with the actual domain name. Then you can access the site directly by calling http://domain.com
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What I did, not to conflict with cached pages is to open a second (and different) browser and check the site there. Hope it helps.