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Heater core/heater control valve

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My heater control valve developed a leak and when I touched the hoses one of the nipples broke off completely.  I bought a new one but it seems I can't get up in there to get the hoses loose from the valve or the heater core.  I've looked for videos and write ups on what needs to be removed and didn't find anything detailed.  I started to try to just take loose the box but  I can't find all the bolts/screws holding it on the firewall.  My ac leaked so it is already empty of freon.  I figure I'll replace the heater core while I'm at it since it is original.  I've see the videos on that at least.  Does anyone have a link to a good video or write up for the removal of the blower motor box on the firewall?  Or any clues on how to take it loose?  Thanks.

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