How to see a theme as admin only

Hey guys,

I’m in the process of upgrading one of my sites and I started developing a new theme. My question is, is there any way to make the theme live for the logged admin only and make the changes live? The rest of the users should see the old theme so they won’t be affected by whatever I screw up there.

I’ve seen there are some plugins that might do that, however the reviews are variable and I’m not sure.

Thanks alot for any suggestions.