A bicycle is a delicate machine. In order to run smoothly, it needs regular maintenance. With the proper tools, most simple maintenance can be done by even a novice rider. If you feel unsure of your capabilities, check with your local bicycle organizations or retailers. Some of them offer great courses in bicycle maintenance.
*If you do your own tune-ups and repairs, it's a good idea to have your bicycle serviced by a knowledgeable professional once a year to increase performance and extend your bicycle's lifespan.