Place finished item in a zippered pillowcase. If you don't, the fibers that come off during felting can ruin your washing machine. Set your machine to the smallest load, the hottest wash and the longest agitation possible. STAY CLOSE BY and check your item frequently, about every 5 minutes. When checking the item, completely remove it from the zippered pillowcase. This is a good time to aid in the shaping and to make sure the item hasn't turned inside out. Place the item back in the zippered pillowcase and resume agitation.
If necessary, repeat the agitation process (without rinsing and spinning), until item is the desired size. Once you're happy with the size, spin the item briefly (always in the pillowcase) to remove excess water. DO NOT WALK AWAY. Stay close so that as soon as the item is done spinning, you can remove it and shape as desired. Let air dry.
Hint: I like to shape my items by stuffing them with plastic grocery bags. This allows me to achieve the exact shape that I want. Once the stocking is mostly dry on the outside, remove the plastic bags and allow to dry inside.
Another Hint: It's okay to felt more that one item at a time, but I recommend putting each one in its own zippered pillowcase. Adjust your water level accordingly.