Hi,
as a former of hiker, I have some experience with leather. Stay away from Neatfoot's Oil. Proofide is safe. There are some hiking boot dressings I have considered trying. But in the end I stuck with the Proofide.
If you want a faster break in on the center of the saddle; this is an old trick from my hiking days. Use a hair dryer to melt the Proofide. While you doing that play the dryer over the sadle LIGHTLY to warm both sides.
Apply the liquid proofide to both sides of the center, and use the dryer to keep it
liquid so it will soak in better.
How long you do this depends on how dangerously you like to live. I did it for about a minute, but on just one side. Since you weigh half what I do, you may need to put some on the underside of the saddle as well.
...Edit...
Just apply Proofide to the underside where it hurts. The idea is to create a small pocket of softness. You also don't need to do it all at once. When I was trying to get my wife comfy on her Brooks for a while it was a weekly routine. We would ride, she would complain, I would apply some Proofide. But... just try and tke her saddle away from her now. You'd draw back bloody stumps.