Handsaws are designed to provide years of good service. However, by wiping the entire surface of the saw blade with an oily rag, you will maximize your saw's performance and extend its life. Many hand saws come with a protective tooth cover. Don't throw this away. It will protect the teeth from any harm that could occur in a busy workshop. If you can't find this cover, cut and slice open an old garden hose and use it to cover the entire length the blade.
If you have ever tried to cut or trim veneered pieces like a door, you know splintering can be a problem. A solution is to use a utility knife with a new blade and a straightedge to mark the cut line deeply on both sides. Some carpenters also use masking tape before making the knife cuts to stabilize the edge and protect wood from the saw making the final cut. Most important is to have a sharp fine-toothed blade in the saw.