Yes just take the 1 or 2, depending on what model engine, allen srews out and the cover will pop right off.
If they are stuck soak the top of the head in a some fuel for a while and very gently tap the top of the stuck valve.
You may also find a broken spring is the fault. If so you can order replacement springs, I would go ahead and install new valves at the same time if that is the case.