The lower grade numbers mean it is coarser. Higher grade numbers mean the paper is finer. To cut your time down, start with a very coarse sandpaper. As you are about to complete the project switch to finer sandpapers to give you a great finish. Make sure you use the right type of sandpaper for the material you are working with. If you are self employed and you will be using your power tools on a daily basis, you are wise to invest in the top of the line heavy duty power tools. You will also want to engrave your name on them because when power tools end up stolen it is likely going to be those name brand ones that end up missing. You will need to remember better than I do to recharge your cordless power tools. While you can easily recharge the batteries, some power tools have a battery that gets weaker over time. This means it won t hold much of a charge. You can choose to purchase a replacement battery at that point. There is less of a risk of accidents with a cordless power tool because you don t have to worry about trips and falls due to the cords. It seems like saws are the one main power tool that hasn t yet been adapted for left handed individuals. For them, a table saw works best because you can choose to cut on either the right side or the left side of the blade. There are some great power tools on the market that can be used easily for left handed individuals including power screwdrivers, routers, nailers, drills, and sanders. The right power tool combined with the right accessory is going to make any type of project go smoother as well as affect the quality of the outcome. In many cases you have the option of several tools that may get the job done, but take the time to find out which one is going to work best. Weigh the pros and cons of each one. You don t want to stop working throughout the day to spend time figuring out how to unjam the power nailer. You will want a power nailer that offers you an adjustable depth controller. This is because you will want to use it for different length of nails. It will also help you get the nails sunk in even with the surface of the project or even countersink them.