How to remove blood stain from carpet

When removing blood stains, everywhere not only on carpet, it's very important to use cold water because hot or even warm water can set the blood stain permanently into the carpet or other fabric.
It's easier to use a spray bottle for this process, but if you don't have one then it's fine. Just soak a clean cloth with cold water and put it on the stained area.
Fill a spray bottle with cold water and spray the area. Use a dry towel to absorb the moisture from the carpet. Repeat the spraying and extracting process until the stain is gone.
Let it dry and then vacuum to restore the texture of the carpet.
If the affected area is too large, you may have to call a carpet professional to clean it, since it could possibly ruin your entire carpet.