PHJim, it doesn't matter if you have a great voice, most importantly is to convey the text to many songs in an interesting way. Sometimes, if you have a dramatic flair, you can even speak the songs as you would recite a poem. This is good if your song has great lyrics.

Also, if you pick a song with a great chorus, your audience will help you out.

The great thing about the song swaps in private homes is that no one is under pressure to be professional about it. If you find this group, you can get the confidence to sing solo.

If a song is interesting, it's hard to damage it.