When i get a machine, the first thing i do, is to download the operational manuals and game rule sheet. It is true, that some people who own machines, don't actually know how to play them.
Take the time to learn on the machine, clean the machine, dissasemble the playfield structures, to actually get to the hard to reach areas.
After a while, you automatically become more confident.
Build up a stockpile of spare parts, rubbers, balls, fuses, plastics, cleaning agents etc.
Have a dedicated toolbox, specifically filled with the tooling required for pinball machines.
Search the web for mods that will add value and fun to your machine, learn how to tinker and change settings via the machine diagnostics.
And at the end of the day, ask questions and have fun.