The Brooks saddle will never get "soft"- it will just slightly form to your sitbones, that's all.
Don't use oil on it. Use Proofhide like the makers recommend. Use it every few days 4 or 5 times on a brand new saddle, then once a month a couple more times, then maybe once every 3 or 4 months to help keep it water resistant.

I rode my first Brooks for 6 months before it seemed broken in. After a year I bought a new Brooks (different model) and I could ride it right off the bat without getting sore. Seems my REAR was sufficiently broken in already!