As someone who has a 1930's house... the walls are probably plaster and wood lathe. Stud finders don't work very well if at all (https://www.familyhandyman.com/article/simple-hack-to-locate...) and cutting into the wall is like chiseling morter... because that basically what you are doing.
I love my plaster walls but dealing with pipes/electrcial is a huge pain.
I ended up teaching myself to do a passable job with repairing plaster and being content with how it is.
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As someone who has a 1930's house... the walls are probably plaster and wood lathe. Stud finders don't work very well if at all (https://www.familyhandyman.com/article/simple-hack-to-locate...) and cutting into the wall is like chiseling morter... because that basically what you are doing.
I love my plaster walls but dealing with pipes/electrcial is a huge pain.
I ended up teaching myself to do a passable job with repairing plaster and being content with how it is.