Hello,
If your phone is able to have ringtones set to MP3's here's what I do. Download Audacity you can find it at
www.audacity.com you will also need the lame file.
Once downloaded, go to file>open and pick a song from your music folder or whatever you save them. And it will come up, as you listen find what part of the song you want to have as a ringtone.
Once you have the song part, go file>save selection as MP3 a window will come up for you to find the "lame" file. This you will only have to do once.
After its saved, you can add it to your phone.
I heard the LG Tritan, you have to have a certain extention for the file... not sure yet for I am still waiting for my phone, hopefully will be here TOMORROW! This is what I do for my BB Curve... but once I get my LG I will check to see if it works for that as well..