With hydrocodone I have to take between 20-30mg to feel a good buzz, anything less and it isn't noticeable at all.
Don't take 4 if you have never done this before, everyone is different. A lot will depend on your weight and metabolism. If you are <200lbs then you should feel SOMETHING off of even one of these, and it should not be too risky either. You can always try larger doses later if you like it.