When wanting to get rid of a wasps nest the best thing to do is to bring in a professional.

However some people choose to do it themselves. Here are some tips that will help you.

Pressurized Bomb (made for Wasps)

Do not use household insecticides, as they work too slowly and you will not have enough time to get away from the swarm.

Follow all of the direction on the bomb very carefully, so that you are not putting yourself and helper at risk.

Stand about 8-10 feet away from the nest.

Be careful to aim the stream right at the nests opening. As long at it hits the outside of the nest it will still kill the insects, but it will be much slower. (the entrance of the nest is best)

If you are allergic to wasp stings do not attempt to do this as there is a chance of getting stung, while doing this yourself.

OR TRY THIS

You will need these things: a helper who can stay calm, a half gallon or kerosene or diesel fuel (do not use gasoline), a shovel, a large wet cloth, protective clothing (as thick as you can stand to wear with a rubber like surface if available). Be sure to tie off jacket cuffs and pant legs so wasps cannot fly under clothing.

1- Pour or spray the fuel into the entrance of the nest. Do not light fuel, the fumes are enough to kill them.
2- Immediately cover the hole with wet cloth so the fumes or wasps (if there) will not escape.
3- RUN

I have used both methods several times and they both work very well.