It doesn't have to be all or nothing! My wife has been vegetarian since I've known her, and vegan for a year and a half or so, and I never fully stopped eating

It doesn't have to be all or nothing! My wife has been vegetarian since I've known her, and vegan for a year and a half or so, and I never fully stopped eating meat until about the same time she went vegan. Before that, what happened to my diet was a reduction in the amount of meat consumed, and (for unrelated health-reasons), the cutting out of most red meat (I started with pork, and then barely ate red meat for a couple years) and shortly before starting to eat a vegetarian diet, I started only eating meat when we ate out (which is maybe 2-4 times a month for us). A few close friends of ours actively try to cut out red meat on most weeknights, for example. Some other friends simply try to incorporate vegetarian/vegan substitutes once a week, or other similar amounts. Whether your concerns are environmental, for health reasons, or about the ethical treatment of animals, you can adjust your diet as much or as little as you want and still have some sort of impact. Just like you don't have to sell your car and bike to work every day in order to cut down on your footprint by, say, biking to the nearby stores instead of driving.