Start by playing single shot and just getting the feel of being at a "disadvantage" in the ROF department.
Try to pick your shots instead of firing in bursts (or if you usually shoot full auto then start firing in short bursts and once that's normal start picking your shots using single shot).
Personally I don't see the appeal of being a BA sniper, I'd much rather have a single shot "auto sniper" (even if it is capped at a lower FPS limit) that can get a decent ROF in case SHTF.
You could just pick up a DMR rifle (like an SPR or something) and transition to BA rifles once you get good at that however that does cost a bit of money (it's probably nothing compared to how much you're going to spend on BA rifle upgrades later down the road though).
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE