I have a few hours in an old Howard DGA-15P - and I'd expect the Beaver to behave the same - and takeoffs are always most impressive. You must open the throttle slowly, so not to run out of rudder authority (especially in a left crosswind!!!).
On a standard day, with a typical load (4100# TOGW), you will be off the ground within 5 seconds of reaching takeoff power (2300 rpm / 36"Hg). At this point, unless you have an obstacle to clear, you can start backing down to 30" and 2000 rpm to conserve engine life - you'll still climb over 1500 fpm @ 85 kt.
Treat yourself to
a video!