Don't worry, the first time I was in a lab, I had no idea what I was doing. By following the lab instructions and using a lot of common sense, I managed to do the lab with flying colors. You'll learn as you are doing. And take Piney's advice on preparations, that is as much as you can do beforehand really. The rest will come to you in the lab. I also recommend going through the terminology of the equipment used and taking extra care knowing what to to with apparatuses, in case you're using any.
When I was young, there was a god with infinite power protecting me. Is there anyone else who felt that way? And was sure about it? but the first time I fell in love, I was thrown down - or maybe I broke free - and I bade farewell to God and became human. Now I don't have God's protection, and I walk on the ground without wings, but I don't regret this hardship. I want to live as a person. -Arina Tanemura