Thickness and hardness of wood will dictate what size of blade should be used for cutting. It's' important to hold your work down with a certain amount of pressure while guiding your work through (to reduce chatter). But at the same time let the blade do the cutting. If you push too hard you may acquire blade breakage, burn marks on your work and overall frustration. Speed of saw is also a variable that comes into play. Other places I would research for advice would be Google, uTube, scroll saw magazines and your local library, just to name a few. And of course practice and experiment. In a short time it will be automatic.