I found a good level to do this on was "All Ghillied Up". Play the level as normal until you get the the bit near the start where Macmillan jumps a fence. But don't follow him over the fence, instead just turn around and you'll get spotted. There will be a guy at the door to the hut, you can take him out if you want, but I'm not sure it's necessary.
There will also be some dogs running at you. Wait for one to attack and melee it (push right stick down) just before it bites. It can be quite hard to get the timing right for this and if you don't it usually means the dog kills you.
If you do die though, it's not a problem because the previous checkpoint is just before you get to the fence, so you just follow Macmillan up to the fence , turn around, and try again. So you can easily try this as many times as you like until you get it right.