On my "never mess with windage" comment .... what that means is do not attempt to center POI by adjusting one's rear sights windage setting or the windage of one's scope. What that will do is leave one without a rifle sighted in for benign wind conditions. In fact, it will only have one sighted in for that particular windy condition which isn't likely to happen while hunting anyway (precisely the same way I mean).

The sights of course need to be sighted for no wind and as cayugad said practice in windy conditions to learn how the wind affects POI. Once you have done that then its quite alright to "aim windage" by pointing in a different place on the target so that POI is centered.

I didn't want any confusion about what I meant by "mess with windage on a windy day". I meant specifically do not change the settings of your sights or scopes.