​​Experts on 15 common mistakes we make, from skipping painting prep to encouraging bad habits in a puppy

So many people buy a £25 inkjet colour printer but end up spending £60 on ink every two months because they use small, expensive cartridges that run out or dry out quickly. It’s a consumer scam. Buy a black and white laser printer instead, and if you want colour photos printed send them to an online photo printer.Jason Dagless