|"Maybe I will get a consultant, but how is that going to help me understand it?"|
You get the right consultant. When I do consulting work, I am very happy and willing to provide not just what to do, but the why's and how's. I'm willing even to have you "drive" and I tell you how to do it as you go through.
However, I don't think I could figure out things like "is a DMZ even the right thing for your network", "what's the best way to implement this for your environment", etc. without being there.
I never said anything about you being stupid. Everyone is ignorant about what they want to learn, or else they'd already know it. I respect your desire to learn, but there's a point where you should not be "learning by doing" if without some supervision it is flat out dangerous.
Going back to the car analogy, even if someone thought they understood the "theory" of how brakes work, do you think it's a good idea the first time someone does a break job on a car they do it without someone who has done it before making sure they're doing it right? Remember, if the breaks fail, someone could get seriously hurt or killed.
In this case, I assume the need for the DMZ is for security reasons. If you do it wrong, you could wind up with servers being hacked, core services not being available, etc. I can tell by what you've posted that you are likely to do something similar to this, and whatever help you could get on this forum still might not help you avoid this. I'd rather not see that happen to you.
For the record, I don't think you're stupid in any way. Stupid implies the inability to learn. Are you knowledgeable enough to pull this off? In my opinion, good chance of not, and the consequences of doing it wrong can be catastrophic, otherwise, doing it wrong isn't a big deal.
I'd rather you learn it AND your network be safe and functioning as it should. I just don't think that's possible in a forum to happen, and it's well worth the money a good consultant would cost you.
If you don't like that advice, fine. Someone else is more than welcome to help you.
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Hats off & applause to rogues & evolution!
The ripple effect is too good not to mention.
If you’re not affected, you’re not paying attention!"