Just asking what everyone does to condition their shins for muay thai.

I've just started at my Uni club. Some folk are saying to just keep kicking a heavy bag as much as possible while others say it's ok to roll metal bars, glass bottles..... down the shin to kill the nerves.

I realise that guys in thailand have been training since they were young so have years of kicking bags and pads behind them. Is it more of a western thing to condition your shins with bars?