Electrical - fuse blowing temporarily after replacing light switch
Shepherd's hooks

Putting a shepherd's hook on the wire, fitting it, squeezing it so it tightly wraps around the screw about 200 degrees (preferably clockwise so it doesn't spread), and tightening the screw to spec -- is the only proper way to use a screw terminal on a receptacle or switch.  (unless the device's written instructions specifically give another method, e.g. breaker lugs or Leviton's screw-and-clamp system). Backstabs are legal, but unreliable, and properly done shepherd's hooks are the way to go.    

The fastest way is use the lonely hole on your wire stripper, that's what it's for, and the pliers on the end of it to squeeze the hook once it's on the screw.  You can get pretty fast at it.  

Wires are held to the screw both by being wrapped around the screw and tightened to spec.  It's a very solid connection that will resist tugging, twisting, and being shoved back into the box with stiff #12 wire.  You can't pull it off like you can a backstab.  If it doesn't feel solid to you, it is wrong.  

If it's not working for you, feel free to ask a question for us to review your technique.  Some edge cases can be tricky.

Watch out for ground wires touching screws or metal box

Often trouble happens when you stuff it back in the box and a ground wire touches a hot screw.  Blam, breaker trip!   But it is also bad if a ground wire touches a neutral screw - that will cause GFCI and AFCI trips.  Manage ground wires carefully and if necessary, wrap the receptacle/switch with tape to cover the screws (In the only direction that makes sense).  3 loops is sufficient. 

The same issue can occur touching the side of a metal box, especially if there is a bit of a drywall gap, which can let the device tilt compared to the box.  

Don't reset breakers 10 times

When a breaker trips once, review your previous work and fix it.  Do not keep resetting the breaker!   The service panel will never dispense a food pellet!

What you actually did was set the wire on fire, causing arcing damage to the wire until the arc damage removed enough copper for it to no longer short.  Or, you broke the breaker.  Both are still dangerous.  Find the root problem (the scorch and sputter damage will be apparent) and replace the breaker.

A breaker's thermal trip mode (the slower trip)  is designed to trip before the wire gets hot enough to start a fire.  Once power is removed, breakers cool down faster than wires, so repeatedly resetting them defeats their thermal protection.  If it trips other than instantly, give the wires 10 minutes (3 songs) to cool before resetting.    

But here's the thing.  You are probably making lots of other mistakes we'll never know about. Mains wiring is lethal and brns down houses, usually later.   If you own this house, and plan to sell it, the home inspection will find bad homeowner work, and likely force you to pay an electrician to take apart everything, check and fix it.  Take your time, let yourself learn, do it perfect.