I always make a sample block-especially the one I am making now. I am using a Creative Grid pineapple block ruler and it was very confusing to me. I watched tutorials and tried making a block a couple of times but could not get it in my head how to trim. Eventually I understood and now I am enjoying making the blocks. I also never cut out fabrics for a whole quilt. I usually cut fabric for about 3 or 4 blocks and make them and then cut more fabric.
This is how I make cookies from a new recipe too-I make the dough and bake one cookie to see how it turns out or if I need to add something!!