Well, get your control as good as you can, but people's cold tolerance can change with many factors, particularly body weight (lighter weight = more cold), tiredness (more tired = more cold), stress etc.
So, next thing to consider is kit - silk or fingerless gloves are OK for indoors work eg keyboard; windproof and waterproof gloves or mittens are warmer for outdoors, cycling etc.
Personally, I find that I get less cold overall (not extremities specifically) now (BMI 25) then when I was a very skinny teenager, when I regularly went alarmingly blue in winter (usually due to canoe capsize drill or being on top of a hill / fell or swimming in sea at Easter) alarming to those who could see my blue lips, merely uncomfortable for me. However, in that time, outdoor kit has also improved greatly, and these days I can afford to buy, or am given in exchange for volunteer marshalling, Goretex jackets, gloves, down jackets, belay jacket, windproof fleeces, fleece sweaters & jackets etc. The weekend just past, I camped solo in a sheepfold up in Howgill Fells and used a Goretex bivvy bag that I bought in 1987 (for an expedition to Svalbard), and a tent I bought second hand in 1988. Both have been reproofed and repaired a few times over the years, but are nowhere near needing to be replaced.
