If you wish to remove the valves you can do so without doing the earlier steps.

We recommend using airsoft specific valve removal tools, but it can be done with other kinds of tools but can potentially more damaging to the magazine

For removing the large output valves without the a special tool you can use pliers with thin ends.

If you are about to take the output valve because it is sticking or has a leak, first try holding open the the valve and spraying some silicone oil down the top hole. This may fix the issue and save you time and effort.