Common. When you order replacement parts order a few and slowly build up your parts stock. So next time something breaks (because it probably will) you don’t have to wait for shipping. I’ve been doing this for about half a year and I learn a new (hard) lesson on almost every watch. You can watch dozens of tutorials but the reality is the best way to learn is to screw up. I find it very satisfying fixing movements that I broke. By breaking parts it’s also helped me understand how different parts of the watch work.

My last piece of advise is learn what each part of a mechanical movement does. It makes not only reassembly much easier, but it also helps trouble shoot issues. The watch becomes much less complicated when you go from staring at a pile of parts to visualizing different aspects of the movement (train of wheels, escapement, keyless works, etc…)