Me? Lead Music?

I was asked to lead the music at a "Baptism Preview Night" the ward had for the kids turning 8 this year.  First of all, I love to sing, but I can't read music and I have never led in front of anyone, ever!  I had one day's notice and was assigned two brand new to Primary baptism songs, so I practiced my heart out.  When we got there last night, the Primary Pres. said, "We don't have a pianist, she can't come, so it's going to be acappella!" ...The only word I can think of to describe the experience is ATROCIOUS!  First of all, no one knew the songs at all!  Just a room of about 25 people who don't work in Primary, the leaders didn't help out much either!  So I was up there, singing a solo, trying to read the words (I had just read over them a few times) and, leading very poorly at the same time!  In the first song, I started with a 4/4 and finished in a 2/4, not once on the beat!  Everyone kindly sang, but only had words and no music, so I was the only one singing any kind of tune!  Never again I say, never again! (I've included one of the songs l had to lead, recognize it?  Not many did!)