I have had tools most of my life. Bike specific tools not so much. Some of the standard tools don't work well when you think they should. To remove some square taper crank bolts, a 15 mm socket is needed but most sockets are too thick. I happen to have a socket set found in the middle of the road, Craftsman, that had a 15mm that works great!
I'll second the double ended cone wrench statement. It is easy to make a thin sheet metal tool, another that can be used twice.

I don't have cable cutters because I use a dremel cut off wheel. I then clean the end up with a bench grinder. The internal housing often melts so pushing a cable through from the other end opens the closed end just fine.

you may want to consider a soldering g un for finishing cable ends, but there are other ways to accomplish the same.

Don't try to misuse a tool like a pipe wrench on the headset or BB cups, get the right tool.

There are alternatives for some, like using a piece of copper tubing split and splayed for removing headset cups or using all thread with washers and nuts for put them back on. But there aren't very many like that.

The most important tool to use is the one between your ears. You can do all kinds of damage using the "right" tool when you don't engage the one above them all.