My .02 - wife absolutely hated her first facial and after about 8 years she gets a couple a week and although doesn't love it will at least ask for it and pose for pics afterwards.

I am also a strong shooter so what really helped early on was letting her take the first shot or two in her mouth or on her chest before doing her face. Took a couple years before she was ok with getting her face totally covered. Also, avoid the nose as you said. I do find that a healthy diet means it doesn't bother the eyes as much either. Also, even though she is a sub it helped a lot telling her how hot she looks, that she takes a load really well, etc.

Position she prefers is on her back with like a chin-to-forehead load. I like her on her knees and do it in the middle of her face from a couple inches away. Careful of her tilting her head too far back as you'll for sure get it up her nose. That took lots and lots of practice to get used to and she still grimaces during, but I feel like that's the best coverage for after pictures. Plus to me at least there's nothing more satisfying to doing it as hard as you can muster point blank in the face of a girl who's on her knees asking for it.