Heaving to in conditions you're describing (as opposed to during heavy weather) is a great way to slow the boat way down so you can move about, eat a sandwich or just chill for a bit. Start the maneuver close hauled. Initiate a tack, but leave the jib cleated. After you've come through the wind, the jib will be back-winded, and you let the mainsheet run free. Then push the tiller slightly to leeward until the boat comes into something like balance ... on a Rhodes 19 it will be pretty easy to feel. You'll probably oscillate gently between about 30 and 60 degrees off the wind. You'll make some forward progress, but very little. When you find the "balance" point for the helm, tie off the tiller to hold it in that position. To get started again, bring the tiller back to center, release the jib and trim it on the new tack, trim the main, and you're on your way. It's a useful and fun skill to master.