The other safety factor to keep in mind is cleanliness. All work surfaces should be kept clean during all stages of the canning process. The food being preserved must itself be rinsed clean. It is particularly important to sterilize the jars and seals before use. We recommend that you read up on home canning before you try it.
Good books are available on the subject, either at the library or in the stores.
Pressure canners almost always come with comprehensive instructions. For additional information contact your local Public Health Office.