Much depends on the personality and skill set of the person. Not everyone is cut out for the job, to be honest. It's high-stress, low-reward work, often with long hours. Law firms are filled with strong personalities and egos (including non-lawyers). Certainly there are common skills that apply across the board. High level of organization, a good memory, patience, strong language and communication skills.
As for which areas are more or less stressful, again that depends on the person, the firm, and even the specific attorneys you work for. Working for a large firm and getting a little experience in several areas is the best way to find out what fits you best. I enjoy the variety of litigation most, others like the complexity of bankruptcy or tax law, even the, ahem, "adventure", of criminal work.
It's not all doom, gloom and misery despite what many of us say. There are good parts to this job.