[Hamervelder]

The most important thing to remember, is that you can't do it all.  It would be nigh impossible, especially this early in the game, for you to carry around enough gear, or have enough AA's, to be able to fulfill a myriad of roles to a high degree of proficiency.  I'd recommend picking one major role and do whatever you can to get better at it.  For example, when my SK was a paladin, I focused on being primarily a healer.  Yes, I could tank, of course, but all of my heals and wards were at least Master I, and that's what I did most of the time.  I  usually duoed with a wizard, so my ability to heal was paramount.  I found that simply focusing on that particular style of play made it easier to do it well, rather than try to master several different styles.