What do you wish you knew about your job when you first started out?
Architect (but not Landscape or Naval) in Boston:
"Work life balance does not exist."
If you can do something other than architecture, do it. The profession is not very accommodating to having a family. Finding a firm that will support that goal is challenging.
Architect (but not Landscape or Naval) in New Haven:
"For love not money."
Architecture is a good profession if you want to make some kind of difference in the built environment, but don't expect to get rich (or even moderately wealthy) doing it. Also don't expect a ton of job security. It is the kind of profession you stay in because you love the work, not the money. That said, some firms are a lot better than others, so research potential employers carefully in advance.