With a Jib - Keep up the boat speed into the tack. Steer lightly when starting the tack and then hard over as the boat slows (Steer 3/4 of full over. Too hard and the rudders act as brakes). Look for a swell or chop to "bank" off of. You can bump a swell as the boat just goes past head to wind if possible. That can help push the bows around. Sheet harder as you come closer to head to wind. Keep the jib sheeted... when the jib back-winds... release the mainsheet and force the sheet out by several feet, otherwise the boat can weather vane into the wind. Keep your weight well aft and hiking right through the tack until the main sail nearly backwinds before trying to cross over. Keep the steering consistent. Try to keep the helm over even when switching sides. If you stall, reverse the rudders as the boat begins to back up and be sure the sheets are well out. Allow the boat to come well onto the new tack before beginning to sheet again... Once the main starts to fill on the new tack, release the jib and sheet it on the new tack side. Sheet in the main slowly at first to get some boat speed and steerage, then sheet harder and head up onto the new tack.