I walked into my first meeting alone, burst into tears and never stopped crying for three meetings...but I knew I was "home", I knew these strangers were my friends, and I felt the hugs and accepted the tissues and felt relief that I could finally just let it all go.
Do whatever makes you most comfortable. Alone or with a friend are both totally acceptable. Just don't be afraid because there is nothing to fear in those rooms, just peace and love and serenity waiting to happen.
Good luck, let us know how it goes.
Hugs