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Jeeper,

Hello.
Let me first say I am not an electrician.
I have owned more than one old house and have done what you speak of many times.

Some questions.
Do have and do you know how to use an ohm meter?
Do you have a circuit (120-220v) tester? 8- 10 bucks home depot?
Allows you to check if wire is hot without uncovering the wire.
Very handy to have around.
Cautions.
Correct. Turn off the breaker then use equipment to make sure there is
no current.
Never touch anything you think might be hot with the inside of your hand,
use the back side.
Make sure whatever wattage you are adding to the circuit will not overload
the amps for that circuit.
Don’t leave any bare wires.
Any connection or screwed in connection must be tight.

I am basing the information on the fact you say you have already done electrical
work.

Take it slow and
# 1 RULE. DO NOT MAKE YOURSELF PART OF THE CIRCUIT.

IANAE
Proceed at your own risk.
Pm me if you have any questions.