Pour the suet into a bowl and add in your bird seed.
Mix well with your hands
Now take a tennis ball size of the mix and squish and squash it together.
The warmth from your hands push your squishing and squeezing will make it compact and turn into a ball. My daughter gave up after ball number 3 but my son pushed on.
We made 12 balls in total 6 to use now and 6 to use later as they will store well in a closed container.
Once you have them made add them to the fat ball holder and position in the garden.