There's actually an enema forum here if you want to check it out. I was scared of them also and never did one until my second week on the juice fast. It really helped and you won't get dependant on them if you don't use it after your fast. You can buy a little bag at the store or on-line and place it in your shower, lie down and let the water go into you. It doesn't hurt. It just feels very odd when you're not used to it and you'll probably have to go potty immediately afterwards but the goal is to hold it in for at least a few minutes. You will be able to get to the toilet. I was worried about that when I first used one so that's why I mentioned it. :)
Just use warm distilled water or chamomille tea. Something mild. It really helps with detox symptoms: bad breath, back & joint pain, oily skin or upset tummy. Enemas were my lifesaver on the fast. Check out the forum and don't try anything weird like coffee or what not when you're first starting.