Here's the flowchart.

You get a machine and you have fun and it's a fine time.
Then something goes wrong, you SEARCH for it on pinside and probably find the answer real quick.
You buy a couple tools and some parts and you slowly learn how to fix the basic things, wear items, common problems etc
All of a sudden a year has gone by and you know know your way around the machine a lot better and there aren't as many surprises and you keep leveling up.
It's USUALLY not something major. Maybe a board blows and you spend a couple hundy in a rare instance.
Nothing to worry aboot. Pretty standard around here people buying & learning as we go.