"Skill"? You press on the accelerator to go faster, you press on it less to slow down. Didn't you already know that???
When I got my Tesla, they seemed to have a "partial" mode. I asked how to engage that for a couple of weeks to get used to it, before I used the full Monty. The saleswoman reacted a bit strongly, saying I shouldn't do that as it's an important feature of the car. So I didn't, and two days later I was used to it.
What does take some getting used to, is not having the regenerative braking if you charge close to 100%. So I don't do that. It's also a bit more wear on the battery.
I don't recall a loss of regeneration in the cold. I think it has to be pretty severe cold. Just getting down to freezing doesn't make so much of an impact, from my recollection.