If you pull out your snowblower for the season only to be greeted with a host of maintenance problems, don't immediately run to the repair shop. Basic problems can sometimes be solved at home. Many basic replacement and repair jobs aren't that complex, and dong the work can save you both money and frustration, especially if you don't realize it until after the first big snow.
Gas doesn't have a long shelf life. So if the snowblower doesn't start, starts and then dies or sput-sput-sputters, check the gas. Assuming you have drained out the old gas, ensure you're using the right fuel for your particular model of snowblower. Check the owner's manual to find out what the manufacturer recommends. Also, pay attention to the oil weight recommendation.
If you're having snowblower problems and everything is in proper order when it comes to the fuel and oil, check the sparkplug. A bad sparkplug can make the snowblower difficult to start or run poorly. To change one, you'll need a replacement sparkplug, wrench and gapping tool. If you don't have the owner's manual handy to know which snowblower repair parts you need, take the old plug with you to the store.
Pull off the sparkplug boot, and unscrew the plug using the socket wrench. Insert the thread of the new plug into the socket, and hand turn for a few turns. Finish tightening with the wrench. Put the sparkplug boot back on, and you're done.