Out of the decorating disasters that I've made in the past, there are three that have been reoccurring and incredibly frustrating. First, painting a room in a colour that ended up looking nothing like I had imagined it would in my head. Second, hanging shelves & pictures on the wonk and having to fill in the holes and start again. Lastly, wallpapering and realising that I didn't have enough paper, or I'd massively over-brought. Luckily, due to the wonder of technology, there are now a number of awesome free DIY apps available that can minimise making the mistakes I've just listed.