Make sure to use the best quality ingredients, especially the butter, you can find and afford. The butter, in particular, really makes a huge different to the final resulting bake.
Use butter that is softened and at room temperature. This is so that the butter and sugar combine easily without needing to be beaten to much. Over beating of the butter in this recipe will affect the final baked results, not giving the texture you want.
Sifting the flour and salt into the butter mixture makes it easier to incorporate the ingredients, hence I would highly recommend it.
If you prefer to use salted butter when making this shortbread, omit the additional salt in the recipe. Please keep in mind using salted butter gives less control of the amount of salt in the bake, so you may find it ends up saltier than you would like.
The dough should come together in clumps when squeezed before pressing into the tin. If it does not, add a little extra butter to achieve the correct consistency.
Cutting the dough once it has been pressed into the tin will make it easier to cut once baked.
Pricking the shortbread before baking allows moisture to escape from the dough during baking. It also prevents the dough from bubbling up in places during baking, resulting in an even shortbread.
As soon as the shortbread comes out of the oven, recut along the cuts done before baking to ensure the shortbread does not seal together.
Sprinkle a little granulated sugar over the top of the baked shortbread for a lovely finishing touch to your Scottish shortbread.