Agree with most of what's been said. My routine is to select the races I want to rate on Thursday. Do the ratings Thursday night (my wife has finally accepted that Thursday night I'm not to be disturbed). Update for scratchings Saturday, get the early prices from Chubby on 4TAB then finalise my bets. I normally place my bets with IAS or Betfair.
Saturday afternoons are then free to go to the local or to Doomben (I rarely go to Jurassic Park). My bets are on long before the demon drink has a chance to take hold.