It takes time, and it has to be done right... When I did my patch field (208 TRS points at the bay, and then the connectors on the other ends- total of about 380 TRS and XLR connectors), it took me about 20 hours all told.
One thing that will speed up this process *dramatically* is to make yourself a connector soldering jig. Get a little chunk of scrap aluminum and mount a 1/4" female jack (TRS or TS, it doesn't matter) and a male and a female panel XLR connector in it. You can then secure this to your workbench with a vise or some c-clamps. When you are soldering a male XLR, for example, you can plug the bare connector insert into the female panel XLR...
This will support the insert to keep it from rolling around and trying to run away as you tin it and solder to it. Making this sort of jig will cut your cable fabrication/repair time in half, and it is something that you only have to do once, ever. I added a wire bracket to mine to hold up the roll of solder so that I don't have to chase it all over
the workbench as well. This really speeds up the process.
True cable nerds will also realize that if you like, you can wire the panel connectors to a battery, some LEDs, and a switch and make your solder jig into a cable tester as well, killing yet another bird with one stone (why not test it as you assemble it, rather than as a separate action?) Season to taste: add female DIN connectors to do MIDI cables, add coaxial power connectors if you do your own wallwart eliminators, yadda yadda. Sky's the limit.
You can go as far with it as you like: but a 1/4" TRS and two XLRs in a little jig panel will be your best friend, if you plan on flinging cables for long. And if you're building a studio, you _will_ be flinging cables...
Hope that helps!