It's your job to be sure the necessary material is covered in the time allotted, while also ensuring trainees understand and embrace the material. Training sessions where the trainer reads from a manual are boring and have very little impact. I encourage you to study the text, capture the intent and present the material in your own style to make the training a dynamic learning experience. Study the material and make it your own. Set yourself up as the expert and be responsible for the results.
Physical preparation includes being sure the training site is conducive to a learning atmosphere.
The set-up of the room is important and I strongly recommend a classroom type of arrangement, i.e. with tables for writing facing the front of the room. It's extremely important that you do not let any training session take on the atmosphere of a meeting. When you have a small group to train, firmly explain to trainees that what they are about to experience is a training session and not a meeting, so the pace of the training will be controlled and specific objectives will be accomplished. Be particular about having the room or training place clean, uncluttered, and furnished with teaching aids you may require, such as flip charts, white boards with marking pens, projectors and other equipment. Make sure everything works.