What's the Most Stressful Part of a Home Renovation?

I am about to embark on a home remodeling project, and I would like to hear from individuals who have undergone such experiences before. Can you please share with me the aspect of home remodeling that proved to be the most stressful for you? Did you find it challenging to stick to your budget, unforeseen delays, looking for a good contractor, material selection, or even living with the ongoing work? Is there anything that you could have done to reduce stress in the course of remodeling?