In a recipe, how much is "to taste"?
To taste is one of those awesome cooking terms that trips people up all the time.  To taste does not mean to what tastes good to you, although you can use that as a determination and your dish should still come out fine for most people.  To taste means that you add salt (or whatever) while tasting the dish and you slowly add until the seasoning tastes perfect.  To properly do this you are going to have to train your palate, but luckily it's not that hard to do.  As a matter of fact, we have a pretty good way to learn it right here.  The end result you are trying to achieve is the point where food tastes the most like itself without adding to much, this the small increments.

The important part to remember is that "to taste" is where your food lives.  It's the thing that is unique to you and a part of what makes every dish you make an expression.