I've had two kinds of pressure to deal with in different jobs, and each one, you deal with it in different ways.
My last job was basically a co-ordinator for an engineering team, plus administration, plus buyer, stock controller etc etc. The workload could occasionally be too much, to put it mildy.
At those times, you almost cease to be able to function. You become rooted and dont know what to do next.
At some stage, i'd make myself disappear. Twas a large site, so no problem doing it. Stay disappeared for a day getting your head going again, decide which jobs you could complete easiest and quickest. Made that my starting point and i always seemed to be able to get going again.
My job now...different pressure. If i cant get a line or machine working, 20 people or so cant work. Its GOT to be fixed. I struggled at first, occasionally got a sweat on with the mental pressure (probably self induced).
Now i dont allow myself to get pressured. It takes as long as it takes. You have to think and work in a methodical way otherwise you miss the obvious.
Its actually a huge release....plus now i think, if you think you know someone else who can do better...go find him. (actually, there are more skilled and knowledgeable people out there who know the machines...but not many. Its very specific machinery that took me 2 years to even begin to know all the faults)