Many organisations offer advice on how to cut meat and dairy from your diet. Most of the organisations below (which are all UK based) provide information on their websites as well as producing really useful leaflets and magazines with recipes and tips.
Vegetarian Society
Vegan Society
Animal Aid (Go Veggie booklet)
VIVA! (Veggie Starter Pack)
PETA (Vegetarian Starter Kit)
Vegan Campaigns (buddies scheme for new vegans)
There are also many online calculators which will tell you about the impact of your diet. Here are a few; the first list are specific to diet, the second list is of general calculators which include diet. Bear in mind that many of the calculators relate to carbon footprints only, not all the other environmental impacts of the livestock industry.
Eating Green Calculator (includes manure, fertiliser, grain and pesticides)
Food Carbon Calculator
Carbon Savings Tables
Eat Low Carbon
WWF Footprint Calculator (tells you how many worlds would be needed if everyone lived like you, kicks off with how much meat you eat!)
Nature Conservancy Carbon Footprint Calculator
Earth Hour One Minute Calculator
Conservation International Eco-Footprint
Carbon Footprint Calculator
