The software we are planning to use is called 3D Avatar Foot Scanner, They have a free version of the app for IOS and Android. Once you download it, just follow the prompts and scan your feet.
Here are a few useful things we have learnt from using the app and chatting with the designers.
It is considerably easier if you have some else scan your feet for you.
When you place your foot on the paper, make sure to place it only halfway across.
Roll your trousers further up your leg than you think.
Have all your weight on your leg, on a solid floor and don’t move.
Ignore the green foot, this is irrelevant, just make sure the four corners of the paper are inside the green box and your heal is in the picture.