Apgrade from 1.7.2 to 1.7.3 RTL site & a lot of modifications

I've made many changes to my Elgg site.
Everything is right to left, css changed, all the mods changed to.
I even removed many options on the site.
Is there a way to upgrade without destroying all the hard work that I have done?
Is it possible to know which pages need to be changed in 1.7.3?
Thank you for your assistance.