Apparently, i forgot to add .L to a couple of my bones and broke the right side when I tried to symmetrieze everything :D (Also forgot to make the unselectable pole selectable to symmatrize too :D )
(and that doesn't include how many times I parented the wrong bone or used the wrong bone for a constraint :D )
You will make a lot of mistakes on the way to mastery, Grady.
It is actually part of your learning and you are gaining valuable experience.
The legs are by far the hardest part - they have so much going on. But embrace those mistakes learning opportunities.
You are getting closer to automaticity with all those things you are forgetting to check or do.
If you keep at it, you won't even notice that you stop making those 'silly' mistakes because you're brain will be on top of it automatically and it will be thinking about the harder stuff.
I hope that makes sense. If it doesn't, just trust me - it's brain science.