There's nothing to "practice" with the windherder skill. The trait explicitly says "Makes basic multi-Wind Enchantment and Spellcasting possible".
We know how to enchant, we know how to cast spells, and we have a solid understanding of the other winds (as per Boney's comment a few pages back). Now we just have to combine those things.
There is no "try", there is only "do".
(Arguably, the other wizard has to practice using their wind around a lot of Ulgu, so I'd suggest we get a Light wizard with some choir experience, because their job is basically just to channel winds for someone else to use and I reckon there's a decent crossover in skill there. That's just a suggestion though, it should work with any wizard if they are good enough).
We know how to enchant, we know how to cast spells, and we have a solid understanding of the other winds (as per Boney's comment a few pages back). Now we just have to combine those things.
There is no "try", there is only "do".
(Arguably, the other wizard has to practice using their wind around a lot of Ulgu, so I'd suggest we get a Light wizard with some choir experience, because their job is basically just to channel winds for someone else to use and I reckon there's a decent crossover in skill there. That's just a suggestion though, it should work with any wizard if they are good enough).