How hard can it be?

How hard can it be, honestly? Sausage and mash is not a complicated dish but for someone who can rebuild a computer with his bare hands, you don't half make a meal of it. First put sausages in oven; then start peeling potatoes, then put water on to boil and then put potatoes in. Sausages now ready; 15 minutes left for potatoes. When potatoes almost done, start thinking about veg. Put water on to boil...well, no need to go on. For gods sake, 20 seconds forethought would have told you that linear meal preparation is not a very effective way of getting dinner on the table.