You can file your income tax return by using the software provided by the Income Tax Department in its portal at https://incometaxindiaefiling.gov.in.
The software for the IT returns for the assessment year 2015-16 are not yet made available in the Income tax department portal and it may take another 10 to 15 days.
If your tax situation is simple, you may file the return on your own, as it is user friendly. Otherwise, you can take the help of tax return preparer or a Chartered Accountant for filing your it return. However,if you need advice on tax planning and tax management, it is advisable to take the help of a Chartered Accountant.