Well, for what it's worth - it does get better when you're retired. Finally you have more time to get things done! (If you planned well financially.)
But I know what you're saying. Never enough time to do what you want to do. You'll find a way to get to it though. Not today but soon.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek