I typically have to train without a spotter. I use a power rack for squats and set the safety bars just below my bottom position. Worst case scenario, I dump it and it falls a couple of inches and makes a loud noise. If you don't have a rack, look for one used -- it's absolutely worth it.
I did once have a spotter unable to save me from an ill-advised free-stand attempt at 495. Since I didn't want to dump it backwards on him, I dumped it forwards over my head. It tore my shirt across my back but didn't hurt me. I figured that was about the worst thing that could happen squatting.
My worst powerlifting screw-up was on bench when I was using a flat palm technique with no thumb wrap-around. On the way up on a rep, the bar suddenly rolled forward off my palms. The spotter caught it
after it bounced off my chest and we were able to rack it. That hurt. It took a few minutes to catch my breath. One dude came over and said I shouldn't get up until the color came back to face -- my buddy pointed out I always looked like that.
I permanently switched to thumb wrap-around grip.
I 100% agree with the comments about balanced fitness. At the time I was into powerlifting, aerobic work was rare. From some pictures I've found from back then, it showed
I feel better being lighter and getting more running in, even if it means I'm not throwing quite as much big iron.