If you are still using an older hand saw, you might be doing it the hard way. Add power to that saw with a sawzall. A sawsall can be used to cut all types of materials - wood, steel, plastics. Plus you can use it to cut shapes or curves, that you can't with a traditional hand saw.
Sawzall blades are small and thin. They come in a variety of styles for the different materials you are cutting. The blades change quickly.
Need to cut a hole in the center of a piece of wood without first drilling a pilot hole? The sawzall will allow you to do this. Just place the blade at a very low angle to the wood and turn it on. Gently push the blade down into the wood. Once through, you can continue your cut.
Sawzalls are versatile and should be in your toolbox.