I had my own plumbing struggle over Christmas... We have a Moen kitchen faucet that we installed in 2009 - the escutcheon (the plate at the bottom) had some peeling of the chrome, so my wife called Moen, and they sent a replacement escutcheon free of charge. So far, so good.
Little did I know that to replace the escutcheon, I would have to completely disassemble the faucet - Which I did. The hardware that clamped the faucet to the sink was very rusted - I must have had a small leak that over time rusted the bolts - a little cursing and contorting (there is no room to move around under the sink) I finally got the mounting hardware off. I disconnected the two supply lines and pulled the faucet up and out.
Then I found that the escutcheon was attached to the brass valve body by 2 tiny completely corroded screws - I thought they were Phillips screws, but I could not loosen them. I ended up using a hack saw to cut away the old escutcheon, piece by piece (some more swearing was appropriate) until finally I could get at those screws. I used a brass wire brush to remove the mineral deposits, and found that the screws required an Allen wrench, but I could not find any of my Allen wrenches, standard or metric that would fit. I finally tried vice grips on the screw head, and was able to remove one screw, but the other sheared off. (Insert swearing here).
Rather than trying to tap or drill out the tiny screw, I ended up using epoxy to glue the escutcheon to the valve body (Basically doing what the screws were intended for).
I then installed the faucet, then realized I forgot the escutcheon gasket. More swearing. When I finally got everything assembled, and turned on the water, I had hot water, but no cold water (and yes, the supply was turned on). Colorful language ensued. I then disassembled everything again and learned that the valve body had collected some debris from my pipes (mostly rust particles) which occluded the cold supply on the faucet, so I blew out the supply lines on the faucet and a tablespoon of crud came out. This resolved the blocked cold water. Finally installed everything at 10:30 Saturday night (I started at noon), and it all works well now. No extra trips to Menards this time (I had what I needed from all my other trips there.).
So my story lacked the multiple trips to Menards, replaced by multiple installations and uninstallations. Sigh.
I'm surprised Santa even made a stop at my house, given how naughty my language was.