You will be okay, I have a Lawn Leveling Company in Austin and I have a few projects I'm doing this week. I have found that if you use strait mason sand, the recovery time is pretty quick. I would suggest that you laydown some Scotts Starter Fertilizer a few days before you spread your material or right after you scalp your yard first. It should come back in time. I won't do any leveling projects after the 20th of this month as I don't want any of my clients to have a beach over the fall/winter....LOL Unless they are over seeded with PRG.
Good Luck,
Marshall