Our brains have established 'neural pathways’ (emotions, thoughts and behaviours we use all the time). These are mostly automatic – they’re your ‘default’ setting.
When we experience change, we have to do things differently. This means we have to form new neural pathways.
With time and repetition, your brain follows the new neural pathway and starts to get used to it.
Then with enough practice, that neural pathway becomes your ‘default’ which means the changes and new routines will get easier as they will start to feel familiar, normal and safe.