I trim my 707 the same as LOU. I "tap" the buttons assigned to trim up and trim down.

That said. Here is how I use it most of the time. When line up on the runway, I set the trim for takeoff. As soon as I have raised the landing gear after takeoff, I hit "Z" to activate the AP (this automatically applies Attitude Hold) and from then on I use the Trim Wheels on the AP to control my 707's attitude for the duration of the climb. I use the same method for descent until Approach and just prior to landing (usually @ DH of 200 feet) when I turn the AP OFF. She lands beautifully most times (depending on weather and such). It works perfectly fine for me using that method.

Mark