I'm nervous about doing anything involving paint, caulk, or water (plumbing) until spring.
It helps to warm up your tools periodically. Also, keep nuts/bolts and metal hardware inside until just before you want to use it. Holding a -17 degree bolt in your bare fingers isn't a lot of fun. Going back inside every 30 minutes to get some tools or parts is a nice excuse to warm yourself anyway.
I have two hand warmers in each glove so I can warm my fingers back up. And, I try to put a thick rug on the ground when I'm underneath.
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