Hi,
There's really not much chance of getting lost - you'll be walking with loads of other people, and there are little yellow arrows all along the way...
Actually, I'd say the real fun of the camino is not having to worry about things like getting lost: to be honest everything is more or less arranged for you (the route, the accommodation, etc), giving you a lot of freedom to focus on your thoughts, the beauty of the landscape, and the good company. It is a very unique and special experience, having the chance to share your ups and downs with a supportive group of 'strangers' from around the world, as well as the support of the camino itself, and the wonderful generous Spanish locals.
Some people are happy with a single piece of paper with the distances between towns and the names of the hostels, others like having more substantial guidebooks, as it gives you something interesting to read while you're zoning out after your day's walk.
You are going to have the time of your life.