Those tutorials can't hurt, but will not help you clean out your EGR valve.
The EGR valve is shown in one of the photos there. If you remove it (the EGR valve, not the filter, not the PCV valve), you may see carbon buildup in some of the passages leading into the valve, or within the valve itself. Your goal is to get rid of the carbon buildup so the exhaust gases (the EG in EGR) can flow freely and the solenoid valve can move freely. It really should be pretty clear to you once you see it. Use a screwdriver, drillbit (in your hand, not in a drill), coathanger, whatever to knock/scrape off whatever you can. If you have a compressor, blow air through there. Use carb cleaner or brake cleaner to help dissolve. Toothbrush (an old one) to brush clean. Can let the carb/brake cleaner soak for a while if you want.
If you know the right polarity, you can try connecting battery voltage to the valve to see if it clicks and moves freely. But mostly this is about cleaning out the obvious carbon buildup.