It depends on your current diet. You may be able to eat a lot of what you are used to, perhaps less often or in smaller portions. Or you may need to add more low protein foods to your diet. To start you need to know exactly how much protein is in everything you eat.
On the internet all the time? Search online at NutriChek.
Limited access to the internet?
Download the protein dictionary to your computer. The protein dictionary comes in a set of nine PDF files.
Download Protein Dictionary
Helping out a friend or relative without access to a computer? The protein dictionary is also available in a single paperback volume.
Buy Protein Dictionary