Selling a house fast is easiest for those properties of lowest value. Cash buyers have always existed for low-end properties that can be easily rented out, or can be fixed up and sold on the retail market.
If your property fits this description you should be able to locate investors in your area interested in a quick cash purchase.
If you have a higher-end property, though, you are likely to have a more difficult time selling your home. The more expensive the home, the fewer qualified buyers and the longer the property stays on the market.
There are many sources of tips on how to make one's home as attractive/presentable for sale as possible. Perhaps these would be of use.