Having said that, I have canned hundreds of pounds of chicken this way and am still alive. :) I love it and think that canned meat is the BEST!
1. I prepare my work space first: get my jars ready. If they are new jars, I just take them out of the package and place them on a large cookie sheet. I like to do this to keep them all together and minimize the germs that get on my counters. If they are previously used jars, make sure they are clean and ready to go.
FYI: for canning meat, it is recommended that you use NEW jars-at least the first time you can-so you decrease the chance of a jar exploding under pressure that has a tiny crack or something. You don't always know where your older jars came from -yard sales, passed down from mothers or grandmothers- so they might have imperfections that could jeopardize your entire pot of meat. Once you have pressure canned using certain jars, keep those separate from all of your other canning jars so that you know they are safe to pressure can with).
2. Cutting the chicken. (Photograph courtesy of my 5 year-old.) I like to wear gloves and an apron and am very aware of what I touch and don't touch once I begin handling the raw chicken. The chicken must be thawed first (in the refrigerator). I cut off any big pieces of fat and then cut up the chicken just enough to fit it into the jars. These were large chicken breasts so I had to cut them more. I canned some chicken tenders once and they were so nice because they didn't need any cutting at all! Just stuff in the jar! Now, here is a little inconsistency I just found. I had learned that you stuff the chicken tight into the jar, but as I was looking up some info I found another person who said to pack it loosely. I have packed mine tightly.
3. Once all of your jars are full (make sure you know how many will fit in your canner first) take a plastic handle or something that won't break the jar (probably not a metal knife or fork) and slide it around to get any air pockets out.
4. I like to add canning salt to mine. I am not sure of the benefit of canning salt or if it's okay to use regular salt, so you can look that up if you have concerns about it. Canning salt does not have iodine in it or anti-caking agents and it keeps your water from being cloudy. And that's all I know.
5. Once the salt is added, take a wet paper towel or napkin and wipe rims of your jars. A dirty rim will prevent the lid from sealing to your jar.
8. Place your lid on your canner and let it get hot! I usually start my stove on high or near high.
10. After the vent has steamed for around 10 minutes, place your weight on the vent.