Coming up with ideas is where the fun resides, which is why the act of planning can seem so darn dull. But it’s also essential, so here’s a way to infuse a challenge into your preparations. Give yourself a constraint. Imagine that you have to get it done with only $50. Or you can’t use the internet. Or your assistant can only help you on Tuesdays and Fridays. Whatever limit you impose on yourself should get your creative juices flowing as you figure things out.