Desserts are actually typically the easiest things for me to do. Everybody says éclairs are very difficult. Pfft. Just mix the puff pastry, pipe it, bake it, fill it. Coat it with chocolate if necessary.
The main difficulty is that baking, which is what most desserts require, really requires a lot more precision than cooking. In cooking, you can easily try substituting cayenne for ancho, or make a dish with chicken instead of fish. In baking, something like even distribution of butter can make the difference between a moist, tender cake and a dry rock. And breads? Well, getting just about anything wrong can ruin it. I've had rolls that got messed up because it was too cold in the room. Wouldn't rise.
Although I think I figured out why my angel-food cakes fell. Back when I was making them, I didn't know the difference between folding and stirring. The difference, of course, being that folding is the technique that DOESN'T collapse the bubbles in the egg-whites.