none of them are easy jobs, it really depends on what your good at.
Engineers have to be good at math and physics which i think is hard
Doctors not only have to be good at science, but they have to be good with people and good on there feet
lawyers have to read alot, they do a lot of research, and sit at a desk all day.
i would pick a doctor, even though they have to do a lot of schooling, there job is the most rewarding, not only do you get to be satisfied by helping people, but you also have a nice paycheck.(if only you didnt have to pay$100,000 a year for malpractice insurance.