Beginner Questions

[arthmoor]

Well I have a few more than likely dumb questions but just getting into this I hope you can all bare with me.

I would like to try a custom UI, particularly Fetish Nightfall, but before I do I have a few basic questions.

If something goes wrong or I don't like it, can I go back to the stock UI with little difficulty?

Can I use a custom UI with a 1204x768 resolution?

Will installing a custom UI affect the skills I have on my hotbars on my 4 toons? Not sure how all that information is stored.

These are some of the more major questions I have, and I might have more along the way. If these questions have been answered before, please point me out to the location of the post, as I was unable to find any after doing a search on the website.

Thanks!
-Arth