last stand 1: Not much to say. The first days are the hardest because you got to handle with to much zombies and you got only weak weapons. They game gets easier with the time, better weapons will help you keeping the zombies off and survivors will help you shooting zombies and best of all reparing your barricades

last stand 2: the biggest problems are without a question the low count of surviviors and sometimes weak barricades. Best way you can do is hoping for suvivors and move on as quickly as you can. The Chainsaw is an underestimaded weapon. You´ll do extreme heavy damage with it and also it will help you to survive even after the barricade is down. Be aware of zombies with weapons they can kill you survivors even with a good barricade! And you WON´T find lot´s of survivors