Ya KNOW, I owner my Presto 23 qt pressure canner for 3 years before I had the nerve to use it.
I WISH I had come upon This video!
For those squeamish, Please know that my "ALWAYS read the instructions" DD helped me put the lid together, and the gauge and the piece that fits over the vent are packed separately, and to put the rubber washer on the Inside when you screw the gauge on. I also have kept the boxes and manual stored in a ziplock bag which I am now Always putting back inside the canner when I store it.
There is a VENT in the lid, and THAT keeps it from building up too much pressure. The weight that goes on top of the vent (after it has visibly released steam for 10 minutes) regulates the pressure.
You CANNOT walk away from this!
It WON'T explode if you walk away, but you will have to stop, let the pressure go all the way down to zero and START OVER.
I don't have time for this, but I attached the gauge wrong last week and I had to start over. The chili canned just fine. I have been cleaning my pantry and looking at the 7 quarts.
I have been pressure canning with DH's help and sitting in my kitchen monitoring the pressure, while I play on my phone.
Usually up to 11 pounds, can go Over, should not drop below.
First batch, I didn't check at least one of my chili jars screw tops. I had cleaned out the roaster with the leftover chili and refridgerated them and I think that the pressure from warm to cold in the fridge loosened at least one of them and there was chili leakage.

ANYWAY, I had to thoroughly clean the canner and the parts.
Not a real problem, but it takes up time.
When I water bath can, I am able to wear a watch and sit on the porch, then check when my timer goes off.
E V E R Y B O D Y HERE who tells you that you can do this...
is right.
Please pat yourself on the back if you have shared your wisdom.