I wouldn't try the rolled up newspaper method or any confrontation method, particularly as you are nervous and he senses it.
Do as Mike and Jane suggest, train by swopping one goodie for another. Don't get into the habit of always trying to take food from your dog - you should only need to take food (or anything edible) away once in a while. If he thinks you are always about to take something off him, he is likely to guard things even more. I know that many people think you can train a dog to give up food by continually taking its food away. This may work for some dogs but not for all and can have quite the opposite effect.
I can take any food off my dogs (including the old mouse!), put my hand in and over their food bowl, etc, with absolutely no fear of being bitten, but it is because they trust me as the provider of food and I rarely mess with their food.
I have rescues and foster and always follow this routine with any new dog: the first meal I give is just put down and then I give them some more food by hand afterwards; the second meal has me dropping more food into their bowl as they are eating, and so on. The aim is to ensure that they know I provide the food and that they can trust me to provide food. Once you have that trust, in my experience, you can take food away, if necessary.