When I got trained for L&D in a small unit I had six years experience in pediatrics, and they said six month of preceptorship would be given. They gave me a L&D textbook, and I gradually went through the chapters in my own time, while applying concepts to real patients on the unit. After a month I was doing NSTs and outpatients myself and reporting my findings to my preceptor. After two months, easy deliveries with the preceptor in the room, three and four months, gradually increasing complications and independence, but verbally going over my plan with a partner. Then for the first year, there was ALWAYS a second person at each delivery with more experience who would help (thank goodness.) After about a year, I was able to be the primary nurse, with the second person having less experience. So the learning went on for a GOOD year.
During my preceptorship, I learned that ACOG has really great guidelines and standards already set out for labor. Even if the hospital is bassakwards, if you know and follow those standards, you will be fine.
That said, you need to find at least one person that is smart and reliable that you can pepper with questions. See if they can be available to text or call if you need someone you trust. Without that, I'd step away from the whole job.