Points to note ..
(a) there should be no need to increase thrust if everything goes according to the gameplan .. as the calculations are predicated on the rules and the thrust ..
(b) if you want to increase, then KNOW the minimum V1/V2 values (for maximum rated thrust) for the conditions .. and respect them
(c) in any case, advance the throttles SLOWLY
(d) unless you happen to be somewhere near limited with the reduced thrust levels, the aircraft generally will go like a cut cat anyway .. and, by the time you get around to thinking about pushing the throttles up .. speed will not be a problem on the ground and you only need to worry about Vmca .. and that WILL bite you if you aren't a bit cautious ...