Fishless cycling sounds very involved and scientific but it's really not too difficult. One of the biggest challenges can be obtaining pure ammonia. You want to make sure you get a type without foaming agents, colors, or scents. That will usually be the cheapest brand available. Add ammonia to the aquarium to reach a level of 5ppm, and keep track of how much ammonia that takes. Add that same amount daily until you start to see nitrites, then reduce the level to ½ the amount you had been adding. Once both ammonia and nitrite read 0, you can do a large volume water change to reduce nitrates to a manageable level and add your new fish! (Many thanks to Nomad for developing this wonderful time saving method.)