When you practice on SQL Server on your local machine you don't want that its services will start up with the computer. As I mentioned before, you should declare the startup method of these services as manual (see
here). After that, you can build two simple batch files that will start and stop the services. Believe me - it's very comfotable to start and stop the services with only one mouse click. The first batch file (I called it sql.bat) contains only two lines:
net start MSSQLSERVER
net start MSSqlServerOLAPService
The second one (sqlend.bat) looks like that:
net stop MSSQLSERVER
net stop MSSqlServerOLAPService
Note that I only start/stop the SQL Server and analysis services, but you can do whatever you like.
Have fun.