Where can I buy the arbor for this type of holesaw. The ones I've found are hex shaped. Could you recommend a n arbour that would fix this hole saw
What type of arbor should I use to fix this holesaw
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Related Solutions
The DeWalt nut drivers (and others also) are very shallow (only meant for driving sheet metal screws (and are magnetic).
As suggested, regular sockets with a rachet handle will cover the hex head and not be pushed-off by the cap head.
You can get a socket adapter for your impact driver and then use your regular sockets: 
Yes, a drywall saw is the tool to use. But for a hole big enough to crawl through, I would not bother with 45 degree cuts. It's more work when making long cuts and is not secure enough to support large patch panels. Cut out a panel all the way to adjoining studs. Then cut out an additional 3/4" strip each side so the replacement panel can bear directly on 1/2 of each stud. You can use a utility knife and chisel to remove the strip. You will hit screws or nails while cutting the strip, remove them as they are found. When installing the new panel, use a new fastener on each side of the joint where ever you found a fastener.
The plain butt joint at top and bottom is not a problem because your patch panel is spanning between studs. You may want to consider installing a removable plywood panel and casing the opening rather than patching the drywall.
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Best Answer
For that type of setup, you usually use this type of bit.
The nut on the shank side screws off, then the bit slips into the hole saw and the nut is tightened back down to hold the saw in place. I found this one at ACE Hardware. But they should be available at any hardware store.
Your best bet would be to take the hole saw with you to the store, and ask an associate to help you find what you need. I found it online using the search term Vermont American #18303 Mandrel.