It does matter what the project is. Not all are "good".
My last significant side project was the opposite of "blissful". In order to preserve and migrate some important personal data I had to reverse engineer an obsolete, undocumented file format. Then I had to use a confusing and badly documented commercial library to convert the data into a modern file format. I had to figure everything out through trial and error with nearly zero support. It was a frustrating pain in the ass from start to finish and while I'm satisfied with the results I didn't enjoy a minute of it.
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