My history: Have nose, navel, ears, and tongue pierced.
1) I know, I know -- it's subjective...but pain? I have my lobes, helix, rook, tragus, conch and navel pierced. Rook hurt the most, conch hurt the least.
My nose was by far the most painful to have done. It was actually extremely painful. Not for a long time, just a few minutes and once a week later when I accidentally tugged it out (yes the screw... owwww).
2) Healing time?
Mine took about a week to not be sensitive, a couple of weeks to look healed, 3 months for complete healing. Like Diva said, it does close extremely fast. So if you want one, plan on wearing it continuously. You don't have the option of taking it out for work.
3) What about getting sick and blowing your nose?
This isn't an issue for me. I originally had a screw one in but I really disliked it. I suspect this has more to do with the specific shape of each individual nose. I had one that wasn't very big and the screw part of it would always stab the inside of my nose no matter how I adjusted it. I figured I just didn't know what I was doing so I went back to my piercer and he couldn't make it fit me properly without cutting the screw part off. He recommend getting a "nose bone" which is a straight one with a little ball on the inside. Since changing to nose bones I have had no issues with discomfort, facial cleansing, sneezing, or colds.
4) Do you think I would suit one?
Your nose looks fine to me. I always thought they were beautiful when women wore tiny diamonds in their noses. I have found that I can use small to medium decorations and get away with it. I do occasionally see women with rings that I think are beautiful but it just has to be what fits with the person, their style, clothing, etc.
I do recommend Titanium. Also, keep it clean but don't go crazy since nose skin is more sensitive than other parts of your body. I "overcleaned" and mine got really dry and peely for a few days. Rinsing it with gentle salt water is the simplest. I actually just sprayed mine with saline and then gently wiped it. Keep your hands off of it as much as possible too.
If you do decide to get it come back and let us know!