1 find a texture pack you really want if its 32x32 or more you need mc patcher or optifine if its 16x16 you wont need it
2 press the download button in the link of the texturepack and download it

3 make the texture zip to a folder

4 open minecraft

5 go to texturepacks icon and click on open texture pack folder

6 drag the texture pack folder that you downloaded and drop it to the texture pack folder

7 go to minecraft click on the texture and then...

8 YOU HAVE IT!!!!!