yes sir!! hard work is the secret!! its definitely okay to take a rest when needed to recoup of course. but as long as you keep busting it, you'll get through this milestone and many more! best of luck my friend.
The only problem with the curl bar is that is very tough to keep balance. With the dumbbells it is more focused and targeting I believe. Also, you do not need too much weight if doing them with the dumbbells on an inclined bench. try it.
My favorite workout day is when I center my lifts on the biceps, triceps and forearms. Because I am enthusiastic about it (as opposed to squats or leg curls) I really go all out. There are so many different work out routines for the arms and wrists that you can always mix it up. Feels good to have that soreness the next day. You know you went all out.