Most of the folks here will opt for the fish less cycle method in order to avoid distressing the fish at all. If you have an existing tank or a friend with one you can use it to seed some filter media with bacteria and that will speed the process up considerably. I normally opt for that together with adding a 1 or 2 inexpensive fish, then after a couple of weeks add a couple more fish, and so on until the bacteria have had a chance to grow and become effective. Keep sniffing your tank and if it begins to have much of an ammonia smell do an immediate water change of up to 50%. Do regular WC's anyway at least once a week and don't disturb or clean your filter during this time. It takes longer than a fish less cycle but if done carefully it won't stress your fish.