First things first, you need to mount your Android phone to the computer. You must find the song which you want to use as your ringtone and copy it into your cellular device.
Open up the android market in your phone. In order to access android market, simply open the application menu and select market. Click on search and type Ringdroid. This application is going to help you create ringtones just the way you want them. Once the search is complete, download the app with the highest rating. Mostly ratings are given with respect to five stars.
This software is basically going to cut any part of a song which is already on your phone. Once you cut a part of a song down, you can then set it up as your ringtone. With Ringdroid installed, open it up. It will most probably be in your applications menu. Once you open this, you will notice how all the music pops up in this application. Find the song which you want to use as a ringtone and select it.
Before cutting the song, you have to play it since you want to know the exact location where you want to cut it from. You are allowed to select a specific portion while the song is playing.
Once you click on the song, it will be graphically displayed in front of you. You can simply double click on the area where you want to start selecting the song, and once that specific part is over you can double click it again with your finger to end selection. This means that a specific portion of the song is now ready to get cut. Click on the options menu and click on select.
With a specific portion of the song selected, save it and later apply it as ringtone.