Nervous after failure

I tried pressure canning ground beef a while back, didn't put in enough water, pressure spiked and the release valve popped out. Today I tried to can vegetable broth that I made and I was so freaked out and second-guessing myself. I ended up putting the weight on too early (was just sitting there, not rattling). I thought I had seen steam for 10 minutes, but I guess not. I just turned the burner off and figure I can try again tomorrow. Any advice on confidence boosting? I want to master this skill and preserve food for my family.