It is absolutely possible to replace sugar in conventional recipes with stevia. The main thing to remember is that it’s important to replace the bulk of sugar with something else when using stevia- applesauce works very well for this.
When replacing a cup of sugar, it is helpful to add 1/3 to ½ cup of applesauce to the recipe to make up for the bulk lost from the sugar. Canned pumpkin, yogurt, or fruit purees can also be used in place of the applesauce.
Stevia does not taste exactly like sugar, and can have a slight aftertaste, particularly when used in large amounts. For this reason, I would err on the side of using less stevia than a recipe calls for when replacing stevia for sugar. Also, most recipes taste better when only part of the sugar in a recipe is substituted for stevia.
Here is a sugar substitution chart for how many stevia packets to use in place of sugar in conventional recipes:
2 tsp. sugar: 1 stevia packet
1 tbs. sugar: 1.5 to 2 stevia packets
½ cup sugar: 9-12 stevia packets
1 cup sugar: 18-24 stevia packets
As an alternative to using stevia packets in baking, Sweetleaf brand stevia has a ready to use stevia baking blend that we have at the store called Sugarleaf. It can be substituted for sugar at a rate of 1/3 of a cup of stevia baking blend to each 1 cup of sugar called for in a recipe.