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If you strictly adhere to electrical safety rules, including assuming that a circuit is hot until proven otherwise, and have some knowledge of how an electrical circuit works, you can likely replace a light switch by yourself without too much trouble. However, it's always advisable to call a nearby electrical pro to do the job if you're unsure of any steps necessary to change a light switch. 

Doorbell wires typically won't spark because they carry low voltage. However, if there's a short circuit or damaged wiring, sparking could occur. Always turn off the power at the breaker box before working with doorbell wires to prevent any risk. If you notice any sparking, it's a sign of a problem that a professional electrician should address.

To install an outlet from existing wiring, you’ll need to choose a location where you can already access existing wiring. The easiest way to do this is to install an outlet on the other side of the wall of an existing outlet. 

Since the wiring is already in place, all you have to do is connect a new cable to the existing wiring and then connect the correct wires through the wall—to the new electrical outlet. Place your new outlet into the opening in the wall and then connect the correct wires to the appropriate terminal screws.

Yes, wire connectors are the better option for securing splices compared to electrical tape. It is not recommended to use electrical tape as it is not secure enough to keep the splices together. Plus, electrical tape is more vulnerable to damage, which can cause a risk of fire over time.