Is there something I should know about downloading Minecraft texture packs?

Only things you need to know are to make sure the texture pack version is up-to-date and that you only need to click "Open Texture Pack Folder" and drag and drop the entire folder into there. Also, make sure you know how much "hd"-ness your computer can handle. There are 16x16, 32x32, 64x64, 124x124+ bit texture packs. The higher the number the greater the detail (usually).