I did this on the kitchen counter.

First, we opened the cabinet door and tied a loop of fine rope around the top hinge on the upper cabinet door. We put an "S" hook on the string / rope. Then we used that hook to hang the bag from it. We put the bag up to give the fluids, then took the bag down and put it away until needed again; the rope and S hook stayed in place. the door had to be opened while I was giving the fluis, but that was OK.

Stood the cat on the counter, Dad held his front legs and talked to him, keeping him busy, while I had both hands free to insert the needle and turn on the little lever. Amber absolutely refused to do anything but stand while we did this; and we did this for 8 months, starting once every other day, ending 4 times per day. He stood and that was the only way he was going to do it.

As for inserting the needle, as above works. I did the shoulder blades - just above. There is a big loose pocket of skin there. It would fill up fast with the fluids; looked like a big balloon; and slowly go down over the next 5 minutes after the cat was off the counter and walking around.

Hardest part was inserting the needle, thinking about it. Cat picks up on your nerves, so take some deep breaths and try to stay calm. Dad would sing, chat whatever, to the cat while I was doing the hard part.

Oh, if you are doing this often, you need to switch sides. The spot may get sore and /or harden over if you insert the needle in the same spot time after time.

Good luck!