In case you get into a boot loop:
You can flash the attached Xposed-Disabler-CWM.zip by Tungstwenty. It will be copied to your (external) SD card when you install Xposed as well. The only thing it does is copying /system/bin/app_process.orig back to /system/bin/app_process, which you can also do yourself (e.g. with adb shell in recovery mode).
You could also create a file /data/xposed/disabled, which causes Xposed to be bypassed as well.
