Alpacas are known for having easy births and great mothering instincts. However, I try to be prepared with all the goodies I might need in case there are problems.
That includes the book that has seen me through 8 years of alpaca births, "Llama and Alpaca Neonatal Care" by B. Smith, K. Timm and P. Long. It has a checklist of everything to watch for during labour, including general timelines of stages of labour. It also has diagrams of difficult positioned cria and how to resolve with manipulations if necessary. I dig it out every year, just in case.
And then we wait...and wait....and check under tails....and postpone hair appointments...and wait...and check the calendar wondering if we made a mistake.