Wash and peel your pears. I slice mine into about 1/4-inch slices, discard the hard middle containing the seeds. I use a lot of my canned pears to make Pear Custard Bars. When I get tired of slicing all those pears, I start canning them as halves! Makes the job go much faster and these are great for the boys when they want a snack.
While I'm doing this, I'm running my jars through the hot cycle on the dishwasher, you can put them in boiling water for 5-10 minutes to sanitize them as well. I also have my large canner on the stove with water heating for the hot water bath part of canning and I put my lids and rings in a small sauce pan over low heat in very hot (not boiling) water.