boeingdream787, quick search through my ops manual says the wind direction speed arrow displayed if wind magnitude is greater than 6 knots and blanked if wind becomes less than 4 knots.Blank until TAS is greater than 101 knots.
So you wont get any indication of wind other than a visual look at a windsock, smoke, trees blowing over unless it is reported by the tower. As for conservatism well that is all about airmanship and how long is a piece of string? If you have any doubt about the accuracy of wind reports then make your mind up on during a walkaround and use nil wind or a tail wind factor.
Our company charts are already factored for 50% of any headwind and and 150% of any tailwind.
Knowing your aircraft is important.I have been off for 3 months but I think that on classic and 800 737's you should achieve full thrust and 80 knots just after the 1500' markers have been passed. I will have to time it myself but V1 is normally reached at 35 secs I think so don't quote me on that one.
We are in the habit of starting a clock for the takeoff to know how long the engine has been at t/o thrust anyway.