When should i limp with pocket pairs for set mining? And how much should I call if someone raises? Presumably the looser /worse the player is and the more he is calling after the flop, more often i should call?

What are the conditions for not limping with small pocket pairs for set mining? I get it that more aggressive players are behind me less I should limp, but can someone whos a solid winner at 2NL tell me his specific conditions?!

Thanks