At least 95% of my outings have been solo. The second you think - gee, a spotter sure would be nice - that's when you need to ask yourself who's going to come help me when I get well and truly stuck? If your route is making you nervous, reevaluate sooner rather than later.
If you know your rout before you go, leave it with someone, call them with changes. I almost never knew my route, I often didn't know which direction I was going until I was on my way.
If think you might not have cell service, get a SPOT. Cheap insurance, particularly when you accidentally break your leg.
For all the years before the SPOT or even before gps, and cell phones, I plead youthful stupidity, and an abundance of self confidence (sometimes misplaced). If you live, you get to learn.
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