Well if you could keep us posted on your progress it would be nice.
The thing i'm scared of is that a low WPF and the Horse Archery penalty might make it hell to shoot.
Wasn't it -60% of your WPF that is taken out if you have no HA skills, then it goes down 10% per HA point. (50% at 1 HA, 40% at 2 HA... so on)
So when you get 4 HA, you need to take 20% out of your WPF stat out to get an idea of how precise you are.
The thing i'm wondering about that 'Rumour' is if the penalty applies to your WPF skill number or the number of WPF skill points you've spent in one domain.
Cheers