Lots of practice, I've been fortunate to be born in the military, so i had a disciplined father and access to more tools (ie a doctor that specializes in ADHD that gave me multiple strategies to help cope) it usually is shrinking down goals into smaller chunks and writing down the entire chunk line to do the thing, so to do grocery, it's plan my menu, figure out what foods i already have, make the list, figure out the space i need (i often walk) go to the store, buy and return, put away the stuff.

For most people it's go and get grocery.