Cutting Guinea Pig Nails.... :'(

Hi, So as you guys should know, your supposed to clip or cut or trim (whichever way you decide to say it) your guinea pigs nails. You should do this about every 2 weeks, or a month. It depends on your Guinea Pig. Anyway, I believe I posted a guinea pig nail clipping video on this website on the Good Small Pet Care Videos page. So, watch that if you need an idea on how to hold your Guinea Pig. I have some terrible news, Norbit cut his nail "Quick or blood vessel" Yesterday, I was clipping his nails, as usual but then as I got to one nail. Norbit flipped and wiggled and shook his foot, I hadn't actually pressed down on it, but I was preparing to cut. So when he shook his foot, poor thing, he cut his own quick. I had him, and I was holding his foot but he took me by surprise. Norbit is usually the calm clipper. Gingy on the other hand always freaks out. Yesterday, they switched roles. It was one of the worst things, I've ever seen. I've never seen any of my pets bleed before. NONE of them in the history of all over 30 pets I've ever had in my ENTIRE life. I have NEVER seen one of them bleed before. I wasn't grossed out nor did I freak out or anything, but I felt SO guilty. At least I was prepared. Norbit is getting the pampered little prince treatment. I put him in a different cage  without Gingy. Instead of bedding he has a soft blanket. He has his big cozy pet bed. Tons of hay and a couple treats. Poor little guy. He's doing much better. I've never cut one of my guinea pigs quick before so I didn't know how much it would hurt him. Anyway, thanks for reading, Good