fuel injectors

I may have more than 1 issue, but concerned about possible damage to cylinders if fuel injector not working. How do I check fuel injectors?

Is it a difficult task to take apart and clean injectors? I'm a novice on engines, and can do basic maintenance but I've never cleaned injectors before and I believe that's a reason for my engine having issues. I've replaced the fuel filter and I'm still having some hesitation/jumping until I'm...