Should I wait to PVP?

[FranktheBank]

I started blue99 about 2 weeks ago, decided to give red a shot. I love PVP servers on other games and some distraction from the level grind, but I have only PVP'd on populated games.

Besides the whole "vendetta while leveling" is there any disadvantage to PVP'ing at lvl 1 or 4 or whatever? I understand that I will probably get a reputation and be killed myself, but sometimes I just wanna drop someone. Am I underestimating how much impact it would have on a low pop server?

I'm currently playing a Wizard, because it was suggested to me as a good non-twink class for PVP. I understand they aren't the best soloists, but are good for PVP.

Thanks for the input.