Dude, you install it like ANY other theme. Download to sdcard, recovery, install zip, reboot.
Some themes still require that you mount /system before you install...
If they're using an updater-script that doesn't correctly mount it, that is. If someone has a theme that still requires mounting system manually.. look at any recent updater-script from 99% of the ROMs out there and fix it (or PM me, and I'll help.. or whatever)
The reason I ask is I saw a couple threads about people looping when installing themes on this ROM. I have just started using it and like it I just am not 100% thrilled with default theme. I just wanted to make sure prior to installing Watermark.
Thanks
No need to wipe data for a theme. Rare, but in some cases wiping cache has helped avoid issues.. and it really doesn't hurt anything to do so.
The bootlooping is from using a version that's NOT COMPATIBLE with the ROM:
GummyJar 2.0 and 2.1 themes ARE compatible with Focused 1.9.5
GummyJar 2.5 themes are NOT compatible with 1.9.5, but ARE compatible with Focused 1.9.7.
HTH!