Nostalrius Begins - Quality wow vanilla realm (1.12)

I just hit 40/41 on my hunter, and with the new capability to wear mail armor, should I be trying to find replacements for the agility heavy leather armor I'm wearing now? I'm grinding to get a mount right now as well as doing quests that give good agility mail armor (only found a few for 40-45) and am wondering how important it is that all my armor eventually becomes mail

Also, if any of you know good mail armor for a hunter around 40/41, let me know where to find it

Don't worry too much about getting mail gear, It's not that big of a deal. Use whatever is an upgrade, the pieces will come on their own.