I'm craving some mixed grain bread something fierce and although I'm waking up my starter, I'm still a couple of days away from biting into a loaf of that goodness! So I found a yeast recipe I want to try, and checked my fridge: my regular yeast is long past expired and my instant (bread machine) yeast is at the bottom of the jar. I only have about half of what the recipe calls for. Can I just extend the proofing times and get away with less yeast? Do I need to adjust the salt or anything? Or will it end in inedible failure? Any expertise appreciated!