well... yes and no.
me, yes, neophite, some confusion, mid level user, probably.
by rounded edges do you mean moldings, curved walls, or walls that arch back/forwards.
vaulted ceilings are a breeze,, circular stairs can be a bit tricky, but aren't bad.
most of the problems people have are in a) trying to model something with too much detail b)not understanding what the program is trying do do or c)not knowing how to use the program.
in a well set up template, 85% of the work can be done by a minimally trained drafter or designer, but some of the more complicated things require actually knowing how to do something.
(think about the fact that 95% of architectural ACAD users could get by with ACADLT 95% of the time, but occasionally need full version to do something specific. it's kinda like that, except it's a power user vs basic user kinda thing)