
Hi Michelle,
What is it you want to achieve. There are three options which you can do.
1: Stay on Modx Evolution and upgrade to 1.0.12 (which has a new updated interface) but some snippets also need updated too (ajaxsearch springs to mind i think (landing page parameters) - but its just upgrading as normal - http://rtfm.modx.com/evolution/1.0/administration/upgrading
2: Opt to go down the fork of clippercms which is still under active development (but dont quote me) again has a different interface
3: Upgrade to Revolution using provisioner and get the new interface that Rev has but have some massive alterations to make to the site e.g replacing Ditto with getResources/pdoTools for example - which sounds like that will be currently beyond your scope.
No upgrade will change the content, only the manager theme and update the snippets that run the website.
I would suggest that you first try option 1 - which is to upgrade the CMS to the latest version to see if the UI improvements help with your current situation. the CMS overall is very easy to use to edit content unless its been setup and configured in a very convoluted way.
I would recommend taking a backup of all the files and database before any updates happen though
Hope that helps and good luck