apple click (or control click if on PC) where it says "vol 0.0" or similar - it'll cycle through peak signal reading (click on this to reset it) and then delay induced by any plugins, before getting back to volume again.
What you'll find is that if you record all your signals really hot (ie peaking -1 to -2 dBFs) you find that to avoid overloading you mix buss (or the console inputs or mix buss if mixing OTB) you'll need to pull the fader levels down quite a long way.
Which is pretty much the same thing as if you'd just recorded at a lower level to start with - you'd then be able to keep the faders at a reasonable level.
Don't really know how messing about with Trim plugs is going to help you...other than if you have recorded really hot, you could trim back the signal and keep the fader at the point where the movements are larger (ie around 0). Not really good practice though - better to do some experiments and find out for yourself what good levels to record at are.