Agree with many of the sentiments already expressed here, definitely worth the effort to learn how to build up your own bike. The knowledge and satisfaction can’t be beat. plus at a time when bike shops are swamped you can be self sufficient.
I picked up a used frame back in the spring and completed the build a few weeks ago. It didn’t hurt that it was mechanical group set, rim brake and external cables… plus, it was titanium (figured I would not break it even when changing out the bottom bracket). Beautiful in its simplicity.
Definitely watch the videos, park tools’ are a great resource, I watched some of these several times over. Understand how things work and not just following steps makes things easier.
As for tools, yes I needed some specific ones, re: bottom bracket, I already had been doing some maintenance but, just consider that the cost of tuition.
And mistakes will be made, I made my fair share, don’t sweat them… you’ll get it correct in the end.