One thing to keep in mind is that a computer PSU can sink a lot of amps into your circuit, and cause a lot of damage if you’ve made a mistake. You can use something like
to get a bit of extra protection (it has polyfuses that turns things off at 1.25 A, long before the PSU detects a short, but that may still destroy things). But the beefier your supply, the more careful you need to be when powering things up the first time.