Upgrade DP version to 7.1.4

Hi!
I actually have a site with DP 7.1.3. I want to upgrade it to DP 7.1.4 but I’m woried, because I’ve done a lot of changes in my site, and I think I will lose them if I change. I will lose them, won’t I?
Is there any best practices to upgrade a site, that allows to work in the new version still it works/shows as I want?
My site is actually running (I launch it a week ago) and I don’t want to stop now for a week o two, in order to work in the new version changes.
Moreover when the forum fall down and most of the information I used where there.

Thank you!

My site is: http://www.ekoguia.com