If it's too long, new or not, it needs to be trimmed.
You don't say what kind of brass (rifle, handgun) it is, so that will also affect the response. But if it's rifle, you need it to be the right length, whether or not it's new.
I always do, full length size and trim if need be. I follow it up with a chamfer, whether I trim or not. I have heard arguements from both sides. My reasoning: Thats how I was taught by my uncle when I started. Haven't had a bullet seating or round chambering issue yet.
I...........Size all new rifle brass. Size new pistol brass. (Usually) Trim rifle brass. (Always) Trim revolver brass. (Eventually, but test with untrimmed range brass on occasion) Never trim auto brass. (Yep, never) YMMV
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