I should mention I make the swan form the tail first,
doing it this way is more of a guesstimate to having the correct amount of balloon left for the neck.
So I have gone to plan "B" for the explanation as you will always end up with a 6/7 finger bubble for the neck which is what is required.

Once the balloon is inflated, after the stretching of the balloon you will have approx. 6 fingers un-inflated.

Make a 7 finger bubble and a 2 finger pinch twist.

Then make another 7 finger bubble and another 2 finger pinch twist.

Tie the knot of the balloon into the second pinch twist, these bubbles are the underneath of the swan.

Then make a 5 finger bubble and wrap around the pinch twist,

then one more 5 finger bubble and wrap around the other pinch twist, these two bubble will be the top of the swan.

You then need to push the air along the remainder of the 260 so you have a 3 finger un-inflated section that will be the beak.

Make a 7 finger bubble for the neck, I have tied this just for taking a photo.

Then you need a 4 finger bubble that will sit in between the two 7 finger bubbles that will be the underneath of the swan.

It pushes these 7 finger bubbles outwards to give a more rounded look for the swan.

The twist nearest to the body is wrapped around the pinch twist for the tail of the swan.

You can leave the tail like this or split it into three later.

The 4 finger bubble is now stretch to the front of the swan and wrapped around the pinch twist,
you do have to push the two pinch twists together a little to achieve this.

The tail of the swan is then divided into three.

For the neck shaping on the swan, pull the un-inflate balloon down, stretching it slightly and hold this against the neck.
Squeeze the bottom of the neck of the swan and this forces the air up over the inflated and un-inflated part of the head of the swan to form the shaping.

Push the neck back into the body.

A little difficult to type but fingers crossed you get the idea?

Perhaps this picture will explain it a little clearer?
You squeeze the air sharply from below my fingers and thumb to shape the top of the head.

Sometimes you do have to massage the front section of the neck and the top of the head to get the desired look of the swan.

The neck here is just slightly pushed between the top body section, not all the way as in the other pictures above.

Again it gives a different look.