UnrealEd is the Unreal Editor - http://www.unrealtechnology.com/features.php?ref=editor
I recommend not trying to do everything. I came from running my own studio where I literally had to do everything besides art related material and at 20 people it was a 12-16 hour day + weekends. It is good to know to entire development process but not doing it all.
With any medium size developer or team you won't have time to everything. Most development studios are compartmentalized, even for producer (art, programming, design, ect). There are some exceptions like the work I do being in charge of gadgets and art (excluding DSS). With gadgets I am involved with their design, animation, programming, and sound but I'm not the one creating them. I have to make sure the overall vision for art/gadgets is met and we don't fall behind schedule.
"doing graphics"
What kind of graphics? UI, Character, Environments?