I bought a GSP bitch last year for falconry this season but at 14 months she's obedient but no way is she steady enough, she is from excellent working lines I'll have to leave her till next year when she matures. In retrospect I wish I'd gone for a GWP. I'm sure eventually she'll be fine.
I recommend you get a copy of The Versatile Gundog, training HPRs for Gun, Rifle and Hawk, by Guy Wallace I found it very useful.
Here's a pic of her at 7 months back in Jan this year. One other problem shes just reminded me, she is really gobby.
Remember two things ruin dogs.............women and kids. Go