Judge - Nope, just walk on in. Just be sure you keep your flint and steel with you in case you need to relight it on the other side. Be ready to dodge, and whatever you do, don't attack a Pigman.
I don't bother unzipping anything. I just use WinRAR to open the texture pack and the minecraft.jar file, then just drag and drop the texturepack files into the game jar.