Completely replace software firewall with hardware firewall?

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Here in the UK, I am on NTL cable and have just one PC attached.

My head is spinning with all the configuration rules and exceptions
which need configuring for a software firewall.

I thought I was doing ok with user guides like the section called:
"Personal firewall configuration for cable modems"

But it turns out that things are still more complicated than that.  
As an example, I installed Outpost and came across this advice page.
Oh wow.  It's all too much!  :-)  I just want protection without
becoming an enthusiast or even expert in firewall configuration.

QUESTION ONE:  If I buy a hardware firewall then will it completely
replace the need for me to have a software firewall?  That would save
me some headaches!

QUESTION TWO:  I might get a second PC and want to attach both PCs to
the cable network at the same time.  I have heard I can do it with a
box which includes a hardware firewall as well as some other
functions.  But exactly what sort of box is it that I would need?
Any suggestions about recommended hardware devices would be welcome.


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