Hi rt1068, good advice from Green bee and Iddee. But there is this option as well. I too am learning how to keep my hives down to just two. I know of other beeks in my area who will come and pick up the swarm for me and take it to expand their own apiary. I used to chase down the swarms and hive them, but got to 5 hives which is too many for the tight neighborhood I live in. So now, I keep an eye on my hives in the spring and I know pretty close to where the swarms are going to land. Then I call my swarm patrol.
Find out who your beekeepers are in your area, get acquainted with them and let them help you as well. I have yet to meet a beek that will turn down Free Bees
Oh! And swarms are awesome and magical to watch, if you see one starting from your hive, not stopping it! Just stand outside and watch it, listen to it, and pay attention to where it lands. So Cool!