How hard is a double major in Aerospace Engineering and Mechanical Engineering?

I plan on going to ASU, and before I get all the comments about how good or bad of a school ASU is, college is what you make of it. If you only pay attention to the parties ir drugs, that's all you're going to get out of it. What I would like to know is, how hard would it be for me to do a double major in Aerospace Engineering and Mechanical Engineering. Both fields are tough, I know, but I have always been intrigued by them. Thank you for any and all answers.